[nop] Drop use of deprecated enc/binding

[doc] Misc improvements
v3.5.0 (2025-04-15)
2025-05-04 15:17:13 +02:00 · 2025-04-15 10:42:51 +02:00 · 2025-04-15 08:58:10 +02:00 · 2025-04-14 23:03:17 +02:00 · 2025-04-14 23:03:17 +02:00 · 2025-04-14 23:03:17 +02:00
26 changed files with 2494 additions and 1643 deletions
--- a/.github/workflows/graal-tests.yml
+++ b/.github/workflows/graal-tests.yml
@ -10,7 +10,7 @@ jobs:
    runs-on: ${{ matrix.os }}
    steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
      - uses: graalvm/setup-graalvm@v1
        with:
          version: 'latest'
@ -18,12 +18,12 @@ jobs:
          components: 'native-image'
          github-token: ${{ secrets.GITHUB_TOKEN }}
-      - uses: DeLaGuardo/setup-clojure@10.0
+      - uses: DeLaGuardo/setup-clojure@12.5
        with:
          lein: latest
          bb: latest
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
        with:
          path: ~/.m2/repository
          key: deps-${{ hashFiles('deps.edn') }}
--- a/.github/workflows/main-tests.yml
+++ b/.github/workflows/main-tests.yml
@ -5,22 +5,22 @@ jobs:
  tests:
    strategy:
      matrix:
-        java: ['17', '18', '19']
+        java: ['17', '19', '21']
        os: [ubuntu-latest]
    runs-on: ${{ matrix.os }}
    steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
-      - uses: actions/setup-java@v3
+      - uses: actions/setup-java@v4
        with:
          distribution: 'corretto'
          java-version: ${{ matrix.java }}
-      - uses: DeLaGuardo/setup-clojure@10.0
+      - uses: DeLaGuardo/setup-clojure@12.5
        with:
          lein: latest
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
        id: cache-deps
        with:
          path: ~/.m2/repository
--- a/.gitignore
+++ b/.gitignore
@ -10,3 +10,4 @@ pom.xml*
 /target/
 /checkouts/
 /logs/
 /wiki/.git
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -1,14 +1,258 @@
-This project uses Break Versioning (https://www.taoensso.com/break-versioning)
+This project uses [**Break Versioning**](https://www.taoensso.com/break-versioning).
-[releases]: https://github.com/taoensso/nippy/releases
+---
-# `v3.3.0-RC1` (2023-08-02)
+# `v3.5.0` (2025-04-15)
-> 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.3.3-RC1)
+- **Dependency**: [on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.5.0)
 - **Versioning**: [Break Versioning](https://www.taoensso.com/break-versioning)
 This is a **general maintenance release** focused on updating dependencies and laying groundwork (read support) for new array types coming in Nippy v3.6.
 It **drops support for Clojure v1.9** but should otherwise be a safe update from (at least) all recent versions of Nippy.
 ## Since `v3.5.0-RC1` (2024-10-28)
 - **\[mod]** Drop official Clojure v1.9 support \[da57206]
 - \[new] Add string array type to default [thaw-serializable-allowlist](https://cljdoc.org/d/com.taoensso/nippy/CURRENT/api/taoensso.nippy#*thaw-serializable-allowlist*) \[bfba594]
 - \[new] Use [Truss exceptions](https://cljdoc.org/d/com.taoensso/truss/CURRENT/api/taoensso.truss#ex-info) on errors \[8d62dc2]
 - \[new] [#184] Incl. cause on non-native freeze failures \[8d10765]
 - \[doc] Clarify `*freeze-fallback*` docstring \[1026ea0]
 ## Since `v3.4.2` (2024-05-26)
 - **\[mod]** Drop official Clojure v1.9 support \[da57206]
 - \[new] Add string array type to default [thaw-serializable-allowlist](https://cljdoc.org/d/com.taoensso/nippy/CURRENT/api/taoensso.nippy#*thaw-serializable-allowlist*) \[bfba594]
 - \[new] Use [Truss exceptions](https://cljdoc.org/d/com.taoensso/truss/CURRENT/api/taoensso.truss#ex-info) on errors \[8d62dc2]
 - \[new] [#184] Incl. cause on non-native freeze failures \[8d10765]
 - \[new] [#175] Mark [cache](https://cljdoc.org/d/com.taoensso/nippy/CURRENT/api/taoensso.nippy#cache) feature as stable \[b217db5]
 - \[doc] Clarify `*freeze-fallback*` docstring \[1026ea0]
 ## Migration info
 | Updating from Nippy       | Changes to API? | Changes to [byte output](https://github.com/taoensso/nippy/wiki/2-Operational-considerations#stability-of-byte-output)? | Rolling update sequence [1] |
 | :------------------------ | :-------------- | :---------------------------------------------------------------------------------------------------------------------- | :-------------------------- |
 | `v3.5.0-RC1` (2024-10-28) | -               | -                                                                                                                       | -                           |
 | `v3.4.2` (2024-05-26)     | -               | -                                                                                                                       | -                           |
 | `v3.4.1` (2024-05-02)     | -               | -                                                                                                                       | -                           |
 | `v3.4.0` (2024-04-30)     | -               | **Yes**                                                                                                                 | -                           |
 | `v3.3.0` (2023-10-11)     | -               | -                                                                                                                       | -                           |
 | `v3.2.0` (2022-07-18)     | -               | -                                                                                                                       | -                           |
 | `v3.1.3` (2022-06-23)     | -               | -                                                                                                                       | -                           |
 > [1] Relevant only when Nippy introduces support for new types **AND** you plan to update Nippy with a **rolling update** (coexisting new and old versions).
 If updating from older versions of Nippy, please see the relevant release notes.
 As always:
 - See [operational considerations](https://github.com/taoensso/nippy/wiki/2-Operational-considerations) for info on: **data compatibility**, **rolling updates**, **rollback support**, etc.
 - It's always a good idea to **ensure adequate testing** in your environment before updating against production data!
 - **Please report any unexpected problems** 🙏
 \- [Peter Taoussanis](https://www.taoensso.com)
 ---
 # `v3.5.0-RC1` (2024-10-28)
 - **Dependency**: [on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.5.0-RC1)
 - **Versioning**: [Break Versioning](https://www.taoensso.com/break-versioning)
 This is a **non-breaking maintenance release** that updates dependencies and includes read support for more native array types to be introduced in a future v3.6 release.
 It should be safe to update from (at least) all recent versions of Nippy.
 | Updating from Nippy   | Changes to API? | Changes to [byte output](https://github.com/taoensso/nippy/wiki/2-Operational-considerations#stability-of-byte-output)? | Rolling update sequence [1] |
 | :-------------------- | :-------------- | :---------------------------------------------------------------------------------------------------------------------- | :-------------------------- |
 | `v3.4.2` (2024-05-26) | -               | -                                                                                                                       | -                           |
 | `v3.4.1` (2024-05-02) | -               | -                                                                                                                       | -                           |
 | `v3.4.0` (2024-04-30) | -               | Yes                                                                                                                     | -                           |
 | `v3.3.0` (2023-10-11) | -               | -                                                                                                                       | -                           |
 | `v3.2.0` (2022-07-18) | -               | -                                                                                                                       | -                           |
 | `v3.1.3` (2022-06-23) | -               | -                                                                                                                       | -                           |
 > [1] Relevant only when introducing support for new types, and for users that do rolling updates
 If updating from older versions of Nippy, please see the relevant release notes.
 As always:
 - See [operational considerations](https://github.com/taoensso/nippy/wiki/2-Operational-considerations) for info on: **data compatibility**, **rolling updates**, **rollback support**, etc.
 - It's always a good idea to **ensure adequate testing** in your environment before updating against production data!
 - **Please report any unexpected problems** 🙏
 \- [Peter Taoussanis](https://www.taoensso.com)
 ---
 # `v3.4.2` (2024-05-26)
 - **Dependency**: [on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.4.2)
 - **Versioning**: [Break Versioning](https://www.taoensso.com/break-versioning)
 ⚠️ This release addresses a [**security vulnerability**](https://github.com/taoensso/nippy/security/advisories/GHSA-vw78-267v-588h) in Nippy's upstream compression library and is **recommended for all existing users**.
 It should be a **straight-forward and non-breaking update** for almost everyone:
 | Updating from Nippy   | Changes to API? | Changes to [byte output](https://github.com/taoensso/nippy/wiki/2-Operational-considerations#stability-of-byte-output)? | Rolling update sequence [1] |
 | :-------------------- | :-------------- | :---------------------------------------------------------------------------------------------------------------------- | :-------------------------- |
 | `v3.4.1` (2024-05-02) | -               | -                                                                                                                       | -                           |
 | `v3.4.0` (2024-04-30) | -               | Yes                                                                                                                     | -                           |
 | `v3.3.0` (2023-10-11) | -               | -                                                                                                                       | -                           |
 | `v3.2.0` (2022-07-18) | -               | -                                                                                                                       | -                           |
 | `v3.1.3` (2022-06-23) | -               | -                                                                                                                       | -                           |
 > [1] Relevant only when introducing support for new types, and for users that do rolling updates
 If updating from older versions of Nippy, please see the relevant release notes.
 As always:
 - See [operational considerations](https://github.com/taoensso/nippy/wiki/2-Operational-considerations) for info on: **data compatibility**, **rolling updates**, **rollback support**, etc.
 - It's always a good idea to **ensure adequate testing** in your environment before updating against production data!
 - **Please report any unexpected problems** 🙏
 \- [Peter Taoussanis](https://www.taoensso.com)
 ---
 # `v3.4.1` (2024-05-02)
 > **Dep**: Nippy is [on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.4.1).  
 > **Versioning**: Nippy uses [Break Versioning](https://www.taoensso.com/break-versioning).
 Like [`v3.4.0`](https://github.com/taoensso/nippy/releases/tag/v3.4.0) but introduces an internal mechanism to help make it easier for some users that do **rolling updates** from earlier versions of Nippy.
 Still, the usual warning applies: data **frozen by Nippy version X** should ideally be **thawed by version >= X**, otherwise you run the risk of the thaw throwing when unfamiliar types are encountered. Please note that this can affect **rolling updates**, and can limit your ability to **revert a Nippy update**. Please ensure adequate testing in your environment before updating against production data!
 \- [Peter Taoussanis](https://www.taoensso.com)
 ## Changes since `v3.4.0`
 * [mod]  Due to some internal format changes, Nippy `v3.4.1` may produce **different serialized output** to `v3.4.0` and earlier versions of Nippy. Most users won't care about this, but you could be affected if you depend on specific serialized byte values (for example by comparing serialized output between different versions of Nippy).
 ---
 # `v3.4.0` (2024-04-30)
 > **Dep**: Nippy is [on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.4.0).  
 > **Versioning**: Nippy uses [Break Versioning](https://www.taoensso.com/break-versioning).
 This is a non-breaking **feature and maintenance** release and should be a safe update for existing users. But as always, please **test carefully and report any unexpected problems**, thank you! 🙏
 **IMPORTANT**: data **frozen by Nippy version X** should always be **thawed by version >= X**, otherwise you run the risk of the thaw throwing when encountering unfamiliar types. Please note that this can affect **rolling updates**, and can limit your ability to **revert a Nippy update**. Please ensure adequate testing in your environment before updating against production data.
 \- [Peter Taoussanis](https://www.taoensso.com)
 ## Changes since `v3.3.0` (2023-10-11)
 * 82a050b [mod] Don't attach empty metadata (meta will now be `nil` rather than `{}`)
 ## Fixes since `v3.3.0` (2023-10-11)
 * 92c4a83 [fix] Broken `*final-freeze-fallback*` default val
 ## New since `v3.3.0` (2023-10-11)
 * fb6f75e [new] Smarter, faster, protocol-based `freezable?` util
 * 6ad5aeb [new] Add `:zstd` compressor, new compressor backend
 * 9db09e1 [new] [#163] Track serialized output in tests
 * dcc6b08 [new] [#164] Update benchmarks
 * f3ff7ae [new] Add native `MapEntry` freezer
 * 37cf415 [new] [#171] Auto strip metadata protocol extensions
 * Misc internal improvements
 ## Everything since `v3.4.0-RC3` (2024-04-10)
 * Update dependencies
 ---
 # `v3.4.0-RC3` (2024-04-10)
 > 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.4.0-RC3), this project uses [Break Versioning](https://www.taoensso.com/break-versioning).
 This is a non-breaking **feature and maintenance** pre-release.  
 Please **test carefully and report any unexpected problems**, thank you! 🙏
 ## New since `v3.3.0`
 * fb6f75e [new] Smarter, faster, protocol-based `freezable?` util
 * 6ad5aeb [new] Add `:zstd` compressor, new compressor backend
 * 9db09e1 [new] [#163] Track serialized output in tests
 * dcc6b08 [new] [#164] Update benchmarks
 * f3ff7ae [new] Add native `MapEntry` freezer
 * 37cf415 [new] [#171] Auto strip metadata protocol extensions
 * Misc internal improvements
 ## Everything since `v3.4.0-RC2`
 * 82a050b [mod] Don't attach empty metadata
 * 92c4a83 [fix] Broken `*final-freeze-fallback*` default val
 * 37cf415 [new] [#171] Auto strip metadata protocol extensions
 * Update dependencies
 # `v3.4.0-RC2` (2024-02-26)
 > 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.4.0-RC2), this project uses [Break Versioning](https://www.taoensso.com/break-versioning).
 This is a non-breaking **feature and maintenance** pre-release.  
 Please **test carefully and report any unexpected problems**, thank you! 🙏
 ## New since `v3.3.0`
 * fb6f75e [new] Smarter, faster, protocol-based `freezable?` util
 * 6ad5aeb [new] Add `:zstd` compressor, new compressor backend
 * 9db09e1 [new] [#163] Track serialized output in tests
 * dcc6b08 [new] [#164] Update benchmarks
 * f3ff7ae [new] Add native `MapEntry` freezer
 * Misc internal improvements
 ## Everything since `v3.4.0-RC1`
 * cb5b7cf [fix] [#169] Can't auto-identify `:zstd` compressor when decompressing
 * cb0b871 Revert [mod] 578c585 (upstream fix now available)
 * Update dependencies
 ---
 # `v3.4.0-RC1` (2024-02-06)
 > 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.4.0-RC1), this project uses [Break Versioning](https://www.taoensso.com/break-versioning).
 This is a non-breaking **feature and maintenance** pre-release.  
 Please **test carefully and report any unexpected problems**, thank you! 🙏
 ## Changes since `v3.3.0`
 * 578c585 [mod] Remove `nippy/snappy-compressor`
 ## New since `v3.3.0`
 * fb6f75e [new] Smarter, faster, protocol-based `freezable?` util
 * 6ad5aeb [new] Add `:zstd` compressor, new compressor backend
 * 9db09e1 [new] [#163] Track serialized output in tests
 * dcc6b08 [new] [#164] Update benchmarks
 * f3ff7ae [new] Add native `MapEntry` freezer
 * Misc internal improvements
 ---
 # `v3.3.0` (2023-10-11)
 > 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.3.3), this project uses [Break Versioning](https://www.taoensso.com/break-versioning).
 Identical to `v3.3.0-RC2`.
 This is a non-breaking **feature and maintenance** release.  
 Please test carefully and report any unexpected problems, thank you! 🙏
 ## Changes since `v3.2.0`
 * [mod] Due to micro-optimizations of some elementary types, Nippy v3.3 may produce **different serialized output** to earlier versions of Nippy. Most users won't care about this, but you could be affected if you depend on specific serialized byte values (for example by comparing serialized output between different versions of Nippy).
 ## Fixes since `v3.2.0`
 * fa1cc66 [fix] [#143] Don't freeze meta info for types that don't support `with-meta`
@ -25,6 +269,75 @@ Please test carefully and report any unexpected problems, thank you! 🙏
 * 3ac06b6 [new] Refactor tools ns, embed dynamic `*freeze-opts*` in wrappers
 * 129ce95 [new] [#151] [#140] Add experimental `public-types-spec`
 ## Other improvements since `v3.2.0`
 * Improved some docstrings
 * Improved generative unit tests
 * Updated internal dependencies
 ---
 # `v3.4.0-beta1` (2023-09-26)
 > 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.4.0-beta1)
 This is a non-breaking **feature** pre-release.  
 Please **test carefully and report any unexpected problems**, thank you! 🙏
 ## New since `v3.3.0-RC2`
 * 6ad5aeb [new] Add `:zstd` compressor, new (faster) compressor backend, better docstrings
 * fb6f75e [new] Smarter, faster, protocol-based `freezable?` util
 * f3ff7ae [new] Add native `MapEntry` freezer
 * fef079d [new] Add subvec to stress data
 * Misc internal improvements
 ## Other improvements since `v3.3.0-RC2`
 * e0cd003 [nop] Update docs
 * 99970d5 [nop] Update benchmark results
 * bcf7673 [nop] Move benchmarks ns under tests dir
 ---
 # `v3.3.0-RC2` (2023-09-25)
 > 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.3.0-RC2)
 Identical to `v3.3.0-RC1` except:
 * Improves some docstrings
 * Improves generative unit tests
 * Updates internal dependencies
 If no unexpected problems come up, `v3.3.0` final is planned for release by the end of September.
 ---
 # `v3.3.0-RC1` (2023-08-02)
 > 📦 [Available on Clojars](https://clojars.org/com.taoensso/nippy/versions/3.3.0-RC1)
 This is a non-breaking **feature and maintenance** pre-release.  
 Please **test carefully and report any unexpected problems**, thank you! 🙏
 ## Fixes since `v3.2.0`
 * fa1cc66 [fix] [#143] Don't freeze meta info for types that don't support `with-meta`
 ## New since `v3.2.0`
 * 89f98b4 [new] [#153] PoC: transducer support on thaw
 * 60bc4e9 [new] [Storage efficiency] PoC: unsigned counts for small core colls
 * 0a9d670 [new] [Storage efficiency] PoC: separate signed long types
 * 8778fa4 [new] Include `:bindings` in ex-data of thaw failures
 * aba153e [new] [#159] Add native impln for `java.sql.Date` (@philomates)
 * d8b1825 [new] [#158] Add `java.lang.ClassCastException` to default thaw allow list (@carlosgeos)
 * 8b7186a [new] Update [benchmark results](https://github.com/taoensso/nippy#performance)
 * 3ac06b6 [new] Refactor tools ns, embed dynamic `*freeze-opts*` in wrappers
 * 129ce95 [new] [#151] [#140] Add experimental `public-types-spec`
 ---
 # `v3.2.0` (2022-07-18)
@ -35,7 +348,7 @@ Please test carefully and report any unexpected problems, thank you! 🙏
 ```
 > This is a non-breaking maintenance release.  
-> See [here](https://github.com/ptaoussanis/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
+> See [here](https://github.com/taoensso/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
 ## New since `v3.1.3`
@ -53,8 +366,9 @@ Please test carefully and report any unexpected problems, thank you! 🙏
 * [#145] [Fix] Freezing custom types with munged field names
 The boxed Boolean bug has been around since the first version of Nippy and is mostly
-relevant to users doing Java interop. For more info see: https://github.com/ptaoussanis/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
+relevant to users doing Java interop. For more info see: https://github.com/taoensso/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
 ---
 # `v3.2.0-RC3` (2022-06-27)
@ -63,7 +377,7 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 ```
 > This is a non-breaking maintenance release.  
-> See [here](https://github.com/ptaoussanis/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
+> See [here](https://github.com/taoensso/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
 ## New since `v3.1.3`
@ -81,8 +395,9 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 * [#145] [Fix] Freezing custom types with munged field names
 The boxed Boolean bug has been around since the first version of Nippy and is mostly
-relevant to users doing Java interop. For more info see: https://github.com/ptaoussanis/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
+relevant to users doing Java interop. For more info see: https://github.com/taoensso/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
 ---
 # `v3.2.0-RC2` (2022-06-23)
@ -91,7 +406,7 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 ```
 > This is a non-breaking maintenance release.  
-> See [here](https://github.com/ptaoussanis/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
+> See [here](https://github.com/taoensso/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
 ## New since `v3.1.3`
@ -108,8 +423,9 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 * [#89 #150] [Fix] Boxed Booleans incorrectly freezing to primitive `true` (@RolT)
 The boxed Boolean bug has been around since the first version of Nippy and is mostly
-relevant to users doing Java interop. For more info see: https://github.com/ptaoussanis/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
+relevant to users doing Java interop. For more info see: https://github.com/taoensso/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
 ---
 # `v3.1.3` (2022-06-23)
@ -118,7 +434,7 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 ```
 > This is a non-breaking, bugfix release.  
-> See [here](https://github.com/ptaoussanis/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
+> See [here](https://github.com/taoensso/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
 ## Fixes since `v3.1.1`
@ -126,8 +442,9 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 * [#89 #150] [Fix] Boxed Booleans incorrectly freezing to primitive `true` (@RolT)
 The boxed Boolean bug has been around since the first version of Nippy and is mostly
-relevant to users doing Java interop. For more info see: https://github.com/ptaoussanis/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
+relevant to users doing Java interop. For more info see: https://github.com/taoensso/nippy/commit/8909a32bdd654a136da385e0e09c9cc44416f964
 ---
 # `v3.1.1` (2020-11-18)
@ -144,7 +461,9 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 [1] Keywords or symbols with >127 characters in their name
-# `v3.1.0` / (2020-11-06)
+---
 # `v3.1.0` (2020-11-06)
 ```clojure
 [com.taoensso/nippy "3.1.0"]
@ -162,8 +481,9 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 * Add several standard `java.time` classes to default `*thaw-serializable-whitelist*`.
 ---
-## `v3.1.0-RC1` (2020-10-24)
+# `v3.1.0-RC1` (2020-10-24)
 ```clojure
 [com.taoensso/nippy "3.1.0-RC1"]
@ -175,6 +495,7 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 * [#135 #128] Added native `freeze/thaw` support for `java.time.Instant` on JVM 8+ (@cnuernber).
 ---
 # `v3.0.0` (2020-09-20)
@ -184,7 +505,7 @@ relevant to users doing Java interop. For more info see: https://github.com/ptao
 > This release is focused on smoothing out rough edges left by `CVE-2020-24164` [#130], and to **ease transition** from versions of Nippy < `v2.15.0 final`.
-> See [here](https://github.com/ptaoussanis/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
+> See [here](https://github.com/taoensso/encore#recommended-steps-after-any-significant-dependency-update) for recommended steps when updating any Clojure/Script dependencies.
 Note that there's **separate details** below for upgrading from `v2.15` vs `v2.14`:
@ -203,8 +524,8 @@ Usually a non-breaking drop-in replacement, but there's some changes you might l
  - [#122] Option to disable freezing and/or thawing of metadata.
  - `freeze` and `thaw` now support opts: `:serializable-allowlist`, `:incl-metadata?`.
-  - New `read-quarantined-serializable-object-unsafe!` util to read quarantined Serializable objects. See [API docs](http://ptaoussanis.github.io/nippy/taoensso.nippy.html#var-read-quarantined-serializable-object-unsafe.21) and/or [#130] for details.
+  - New `read-quarantined-serializable-object-unsafe!` util to read quarantined Serializable objects. See [API docs](http://taoensso.github.io/nippy/taoensso.nippy.html#var-read-quarantined-serializable-object-unsafe.21) and/or [#130] for details.
-  - Add `allow-and-record-any-serializable-class-unsafe` util. See [API docs](http://ptaoussanis.github.io/nippy/taoensso.nippy.html#var-allow-and-record-any-serializable-class-unsafe) and/or [#130] for details.
+  - Add `allow-and-record-any-serializable-class-unsafe` util. See [API docs](http://taoensso.github.io/nippy/taoensso.nippy.html#var-allow-and-record-any-serializable-class-unsafe) and/or [#130] for details.
 ## Upgrading from `v2.14` (may be BREAKING)
@ -230,7 +551,8 @@ Likely breaking. Please see [#130] for **detailed upgrade instructions**.
  - [#120] Update `freezable?` to cover `nil`
-  
+---
 # Earlier releases
-See [here][releases] for earlier releases.
+See [here](https://github.com/taoensso/nippy/releases) for earlier releases.
--- a/README.md
+++ b/README.md
@ -1,20 +1,19 @@
 <a href="https://www.taoensso.com/clojure" title="More stuff by @ptaoussanis at www.taoensso.com"><img src="https://www.taoensso.com/open-source.png" alt="Taoensso open source" width="340"/></a>  
-[**Documentation**](#documentation) | [Latest releases](#latest-releases) | [Get support][GitHub issues]
+[**API**][cljdoc] | [**Wiki**][GitHub wiki] | [Latest releases](#latest-releases) | [Get support][GitHub issues]
 # Nippy
-#### The fastest serialization library for Clojure
+### Fast serialization library for Clojure
 Clojure's rich data types are awesome. And its [reader](https://clojure.org/reference/reader) allows you to take your data just about anywhere. But the reader can be painfully slow when you've got a lot of data to crunch (like when you're serializing to a database).
-Nippy is an attempt to provide a reliable, high-performance **drop-in alternative to the reader**.
+Nippy is a mature, high-performance **drop-in alternative to the reader**.
-Used by [Carmine](https://github.com/taoensso/carmine), [Faraday](https://github.com/ptaoussanis/faraday), [PigPen](https://github.com/Netflix/PigPen), [Onyx](https://github.com/onyx-platform/onyx), [XTDB](https://github.com/xtdb/xtdb), and others.
+It is used at scale by [Carmine](https://www.taoensso.com/carmine), [Faraday](https://www.taoensso.com/faraday), [PigPen](https://github.com/Netflix/PigPen), [Onyx](https://github.com/onyx-platform/onyx), [XTDB](https://github.com/xtdb/xtdb), [Datalevin](https://github.com/juji-io/datalevin), and others.
 ## Latest release/s
- `2023-08-02` `3.3.0-RC1` (dev): [changes](../../releases/tag/v3.3.0-RC1)
+- `2025-04-15` `v3.5.0`: [release info](../../releases/tag/v3.5.0)
 - `2022-07-18` `3.2.0` (stable):  [changes](../../releases/tag/v3.2.0)
 [![Main tests][Main tests SVG]][Main tests URL]
 [![Graal tests][Graal tests SVG]][Graal tests URL]
@ -23,40 +22,88 @@ See [here][GitHub releases] for earlier releases.
 ## Why Nippy?
- Small, simple **all-Clojure** library
+- Small, simple **pure-Clojure** library
 - **Terrific performance**: the [best](#performance) for Clojure that I'm aware of
- Comprehensive support for **all standard data types**
+- Comprehensive support for [all standard data types](../../wiki/1-Getting-started#deserializing)
- Easily extendable to **custom data types**
+- Easily extendable to [custom data types](../../wiki/1-Getting-started#custom-types)
- **Robust test suite**, incl. full coverage for every supported type
+- **Robust test suite** incl. coverage of every supported type
- Auto fallback to Java Serializable when available
+- **Mature** and widely used in production for 12+ years
- Auto fallback to Clojure Reader for all other types (including tagged literals
+- Optional auto fallback to [Java Serializable](https://taoensso.github.io/nippy/taoensso.nippy.html#var-*freeze-serializable-allowlist*) for [safe](https://cljdoc.org/d/com.taoensso/nippy/CURRENT/api/taoensso.nippy#*freeze-serializable-allowlist*) types
- Pluggable **compression** with built-in [LZ4](https://code.google.com/p/lz4/)
+- Optional auto fallback to Clojure Reader (including tagged literals)
- Pluggable **encryption** with built-in AES128
+- Optional smart **compression** with [LZ4](https://code.google.com/p/lz4/) or [Zstandard](https://facebook.github.io/zstd/)
- Tools for easy + robust **integration into 3rd-party libraries**, etc.
+- Optional [encryption](../../wiki/1-Getting-started#encryption) with AES128
 - [Tools](https://taoensso.github.io/nippy/taoensso.nippy.tools.html) for easy + robust **integration into 3rd-party libraries**, etc.
 - Powerful [thaw transducer](https://taoensso.github.io/nippy/taoensso.nippy.html#var-*thaw-xform*) for flexible data inspection and transformation
 ## Quick example
 Nippy's super easy to use:
 ```clojure
 (require '[taoensso.nippy :as nippy])
 ;; Freeze any Clojure value
 (nippy/freeze <my-value>) ; => Serialized byte[]
 ;; Thaw the byte[] to get back the original value:
 (nippy/thaw (nippy/freeze <my-value>)) ; => <my-value>
 ```
 See the [wiki](https://github.com/taoensso/nippy/wiki/1-Getting-started#deserializing) for more.
 ## Operational considerations
 ### Data longevity
 Nippy is widely used to store **long-lived** data and promises (as always) that **data serialized today should be readable by all future versions of Nippy**.
 But please note that the **converse is not generally true**:
 - Nippy `vX` **should** be able to read all data from Nippy `vY<=X` (backwards compatibility)
 - Nippy `vX` **may/not** be able to read all data from Nippy `vY>X` (forwards compatibility)
 ### Rolling updates and rollback
 From time to time, Nippy may introduce:
 - Support for serializing **new types**
 - Optimizations to the serialization of **pre-existing types**
 To help ease **rolling updates** and to better support **rollback**, Nippy (since version v3.4) will always introduce such changes over **two version releases**:
 - Release 1: to add **read support** for the new types
 - Release 2: to add **write support** for the new types
 Starting from v3.4, Nippy's release notes will **always clearly indicate** if a particular update sequence is recommended.
 ### Stability of byte output
 It has **never been an objective** of Nippy to offer **predictable byte output**, and I'd generally **recommend against** depending on specific byte output.
 However, I know that a small minority of users *do* have specialized needs in this area.
 So starting with Nippy v3.4, Nippy's release notes will **always clearly indicate** if any changes to byte output are expected.
 ## Performance
-Since its earliest versions, Nippy has consistently been the **fastest serialization library for Clojure** that I'm aware of. It offers:
+Nippy is fast! Latest [benchmark](../../blob/master/test/taoensso/nippy_benchmarks.clj) results:
- Roundtrip times **>12x faster** than `tools.reader` with **60% smaller** data size.
+![benchmarks-png](../../raw/master/benchmarks.png)
 - Roundtrip times **>2x faster** than `data.fressian` with **30% smaller** data size.
-![benchmarks-png](benchmarks.png)
+PRs welcome to include other alternatives in the bench suite!
 The [benchmark code](https://github.com/taoensso/nippy/blob/master/src/taoensso/nippy/benchmarks.clj) can be easily run in your own environment.
 ## Documentation
- [Full documentation][GitHub wiki] (**getting started** and more)
+- [Wiki][GitHub wiki] (getting started, usage, etc.)
- Auto-generated API reference: [Codox][Codox docs], [clj-doc][clj-doc docs]
+- API reference via [cljdoc][cljdoc]
 ## Funding
-You can [help support][sponsor] on this project, thank you!! 🙏
+You can [help support][sponsor] continued work on this project, thank you!! 🙏
 ## License
-Copyright &copy; 2012-2023 [Peter Taoussanis][].  
+Copyright &copy; 2012-2025 [Peter Taoussanis][].  
 Licensed under [EPL 1.0](LICENSE.txt) (same as Clojure).
 <!-- Common -->
@ -70,8 +117,7 @@ Licensed under [EPL 1.0](LICENSE.txt) (same as Clojure).
 <!-- Project -->
-[Codox docs]:   https://taoensso.github.io/nippy/
+[cljdoc]: https://cljdoc.org/d/com.taoensso/nippy/CURRENT/api/taoensso.nippy
 [clj-doc docs]: https://cljdoc.org/d/com.taoensso/nippy/
 [Clojars SVG]: https://img.shields.io/clojars/v/com.taoensso/nippy.svg
 [Clojars URL]: https://clojars.org/com.taoensso/nippy
--- a/SECURITY.md
+++ b/SECURITY.md
@ -0,0 +1,13 @@
 # Security policy
 ## Advisories
 All security advisories will be posted [on GitHub](https://github.com/taoensso/nippy/security/advisories).
 ## Reporting a vulnerability
 Please report possible security vulnerabilities [via GitHub](https://github.com/taoensso/nippy/security/advisories), or by emailing me at `my first name at taoensso.com`. You may encrypt emails with [my public PGP/GPG key](https://www.taoensso.com/pgp).
 Thank you!
 \- [Peter Taoussanis](https://www.taoensso.com)
--- a/bb/graal_tests.clj
+++ b/bb/graal_tests.clj
@ -28,7 +28,9 @@
  (let [graalvm-home (System/getenv "GRAALVM_HOME")
        bin-dir (str (fs/file graalvm-home "bin"))]
    (shell (executable bin-dir "gu") "install" "native-image")
-    (shell (executable bin-dir "native-image") "-jar" "target/graal-tests.jar" "--no-fallback" "graal_tests")))
+    (shell (executable bin-dir "native-image")
      "--features=clj_easy.graal_build_time.InitClojureClasses"
      "--no-fallback" "-jar" "target/graal-tests.jar" "graal_tests")))
 (defn run-tests []
  (let [{:keys [out]} (shell {:out :string} (executable "." "graal_tests"))]
--- a/benchmarks.png
+++ b/benchmarks.png
--- a/project.clj
+++ b/project.clj
@ -1,33 +1,45 @@
-(defproject com.taoensso/nippy "3.3.0-RC1"
+(defproject com.taoensso/nippy "3.5.0"
  :author "Peter Taoussanis <https://www.taoensso.com>"
-  :description "The fastest serialization library for Clojure"
+  :description "Fast serialization library for Clojure"
-  :url "https://github.com/taoensso/nippy"
+  :url "https://www.taoensso.com/nippy"
  :license
  {:name "Eclipse Public License - v 1.0"
   :url  "https://www.eclipse.org/legal/epl-v10.html"}
  :dependencies
-  [[org.clojure/tools.reader "1.3.6"]
+  [[org.clojure/tools.reader "1.5.2"]
-   [com.taoensso/encore      "3.63.0"]
+   [com.taoensso/encore      "3.142.0"]
-   [org.iq80.snappy/snappy   "0.4"]
+   [org.tukaani/xz           "1.10"]
-   [org.tukaani/xz           "1.9"]
+   [io.airlift/aircompressor "2.0.2"]]
-   [org.lz4/lz4-java         "1.8.0"]]
+
  :test-paths ["test" #_"src"]
  :profiles
  {;; :default [:base :system :user :provided :dev]
-   :provided {:dependencies [[org.clojure/clojure "1.11.1"]]}
+   :provided {:dependencies [[org.clojure/clojure "1.11.4"]]}
-   :c1.11    {:dependencies [[org.clojure/clojure "1.11.1"]]}
+   :c1.12    {:dependencies [[org.clojure/clojure "1.12.0"]]}
-   :c1.10    {:dependencies [[org.clojure/clojure "1.10.1"]]}
+   :c1.11    {:dependencies [[org.clojure/clojure "1.11.4"]]}
-   :c1.9     {:dependencies [[org.clojure/clojure "1.9.0"]]}
+   :c1.10    {:dependencies [[org.clojure/clojure "1.10.3"]]}
-   :test
+   :graal-tests
   {:source-paths ["test"]
    :main taoensso.graal-tests
    :aot [taoensso.graal-tests]
    :uberjar-name "graal-tests.jar"
    :dependencies
    [[org.clojure/clojure                  "1.11.3"]
     [com.github.clj-easy/graal-build-time "1.0.5"]]}
   :dev
   {:jvm-opts
    ["-server"
     "-Xms1024m" "-Xmx2048m"
     "-Dtaoensso.elide-deprecated=true"
     "-Dtaoensso.nippy.thaw-serializable-allowlist-base=base.1, base.2"
-     "-Dtaoensso.nippy.thaw-serializable-allowlist-add=add.1 , add.2"]
+     "-Dtaoensso.nippy.thaw-serializable-allowlist-add=add.1 , add.2"
     #_"-Dtaoensso.nippy.target-release=320"
     #_"-Dtaoensso.nippy.target-release=350"]
    :global-vars
    {*warn-on-reflection* true
@ -35,35 +47,18 @@
     *unchecked-math*     false #_:warn-on-boxed}
    :dependencies
-    [[org.clojure/test.check        "1.1.1"]
+    [[org.clojure/test.check    "1.1.1"]
-     [org.clojure/data.fressian     "1.0.0"]
+     [org.clojure/data.fressian "1.1.0"]]
     [org.xerial.snappy/snappy-java "1.1.10.3"]]}
-   :graal-tests
+    :plugins
-   {:dependencies [[org.clojure/clojure "1.11.1"]
+    [[lein-pprint  "1.3.2"]
-                   [com.github.clj-easy/graal-build-time "0.1.4"]]
+     [lein-ancient "0.7.0"]]}}
    :main taoensso.graal-tests
    :aot [taoensso.graal-tests]
    :uberjar-name "graal-tests.jar"}
   :dev
   [:c1.11 :test
    {:plugins
     [[lein-pprint  "1.3.2"]
      [lein-ancient "0.7.0"]
      [com.taoensso.forks/lein-codox "0.10.10"]]
     :codox
     {:language #{:clojure #_:clojurescript}
      :base-language :clojure}}]}
  :test-paths ["test" #_"src"]
  :aliases
  {"start-dev"     ["with-profile" "+dev" "repl" ":headless"]
   ;; "build-once" ["do" ["clean"] ["cljsbuild" "once"]]
   "deploy-lib"    ["do" #_["build-once"] ["deploy" "clojars"] ["install"]]
-   "test-clj"     ["with-profile" "+c1.11:+c1.10:+c1.9" "test"]
+   "test-clj"     ["with-profile" "+c1.12:+c1.11:+c1.10" "test"]
-   ;; "test-cljs" ["with-profile" "+test" "cljsbuild"   "test"]
+   ;; "test-cljs" ["with-profile" "+c1.12" "cljsbuild"   "test"]
   "test-all"     ["do" ["clean"] ["test-clj"] #_["test-cljs"]]})
--- a/src/taoensso/nippy.clj
+++ b/src/taoensso/nippy.clj
--- a/src/taoensso/nippy/benchmarks.clj
+++ b/src/taoensso/nippy/benchmarks.clj
@ -1,127 +0,0 @@
 (ns taoensso.nippy.benchmarks
  "Nippy benchmarks."
  (:require
   [clojure.data.fressian :as fress]
   [taoensso.encore       :as enc]
   [taoensso.nippy        :as nippy]))
 ;;;; Reader
 (defn- freeze-reader [x]   (enc/pr-edn   x))
 (defn- thaw-reader   [edn] (enc/read-edn edn))
 ;;;; Fressian
 (defn- freeze-fress [x]
  (let [^java.nio.ByteBuffer bb (fress/write x)
        len (.remaining bb)
        ba  (byte-array len)]
    (.get bb ba 0 len)
    (do      ba)))
 (defn- thaw-fress [^bytes ba]
  (let [bb (java.nio.ByteBuffer/wrap ba)]
    (fress/read bb)))
 (comment (-> data freeze-fress thaw-fress))
 ;;;; Benchable data
 (def data
  "Map of data suitable for benching, a subset of
  `nippy/stress-data-comparable`."
  (reduce-kv
    (fn [m k v]
      (try
        (-> v freeze-reader thaw-reader)
        (-> v freeze-fress  thaw-fress)
        m
        (catch Throwable _ (dissoc m k))))
    nippy/stress-data-comparable
    nippy/stress-data-comparable))
 (comment
  (clojure.set/difference
    (set (keys nippy/stress-data-comparable))
    (set (keys data))))
 ;;;;
 (defn- bench1
  [{:keys [laps warmup] :or {laps 1e4, warmup 25e3}} freezer thawer sizer]
  (let [data-frozen (freezer data)
        time-freeze (enc/bench laps {:warmup-laps warmup} (freezer data))
        time-thaw   (enc/bench laps {:warmup-laps warmup} (thawer  data-frozen))
        data-size   (sizer data-frozen)]
    {:round (+ time-freeze time-thaw)
     :freeze   time-freeze
     :thaw                 time-thaw
     :size  data-size}))
 (comment (bench1 {} nippy/freeze nippy/thaw count))
 (defn bench
  [{:keys [all? reader? fressian? fressian? lzma2? laps warmup]
    :or   {laps      1e4
           warmup    25e3}}]
  (println "\nStarting benchmarks")
  (println "---")
  (let [results_ (atom {})]
    (when (or all? reader?)
      (println "Benching Reader...")
      (swap! results_ assoc :reader
        (bench1 {:laps laps, :warmup warmup}
          freeze-reader thaw-reader
          (fn [^String s] (count (.getBytes s "UTF-8"))))))
    (when (or all? fressian?)
      (println "- Benching Fressian...")
      (swap! results_ assoc :fressian (bench1 {:laps laps, :warmup warmup} freeze-fress thaw-fress count)))
    (when (or all? lzma2?)
      (println "- Benching Nippy/LZMA2...")
      (swap! results_ assoc :nippy/lzma2
        (bench1 {:laps laps, :warmup warmup}
          #(nippy/freeze % {:compressor nippy/lzma2-compressor})
          #(nippy/thaw   % {:compressor nippy/lzma2-compressor})
          count)))
    (println "- Benching Nippy/encrypted...")
    (swap! results_ assoc :nippy/encrypted
      (bench1 {:laps laps, :warmup warmup}
        #(nippy/freeze % {:password [:cached "p"]})
        #(nippy/thaw   % {:password [:cached "p"]})
        count))
    (println "- Benching Nippy/default...")
    (swap! results_ assoc :nippy/default (bench1 {:laps laps, :warmup warmup} nippy/freeze      nippy/thaw      count))
    (println "- Benching Nippy/fast...")
    (swap! results_ assoc :nippy/fast (bench1 {:laps laps, :warmup warmup} nippy/fast-freeze nippy/fast-thaw count))
    (println "- Benchmarks complete! (Time for cake?)")
    (let [results @results_]
      (println "\n")
      (doseq [[k v] results] (println k " " v))
      (do           results))))
 (comment
  (do
    (set! *unchecked-math* false)
    (bench {:all? true}))
  ;; 2023 Aug 1, 2020 Apple MBP M1
  ;; [com.taoensso/nippy        "3.2.0"]
  ;; [org.clojure/tools.reader  "1.3.6"]
  ;; [org.clojure/data.fressian "1.0.0"]
  {:reader          {:round 35041, :freeze 5942,  :thaw 29099, :size 39389}
   :fressian        {:round 6241,  :freeze 3429,  :thaw 2812,  :size 22850}
   :nippy/lzma2     {:round 33561, :freeze 20530, :thaw 13031, :size 11444}
   :nippy/encrypted {:round 3390,  :freeze 1807,  :thaw 1583,  :size 16468}
   :nippy/default   {:round 2845,  :freeze 1513,  :thaw 1332,  :size 16440}
   :nippy/fast      {:round 2634,  :freeze 1338,  :thaw 1296,  :size 28454}})
--- a/src/taoensso/nippy/compression.clj
+++ b/src/taoensso/nippy/compression.clj
@ -1,8 +1,13 @@
 (ns ^:no-doc taoensso.nippy.compression
  "Private, implementation detail."
-  (:require [taoensso.encore :as enc])
+  (:require
-  (:import  [java.io ByteArrayInputStream ByteArrayOutputStream DataInputStream
+   [taoensso.truss  :as truss]
-             DataOutputStream]))
+   [taoensso.encore :as enc])
  (:import
   [java.nio ByteBuffer]
   [java.io
    ByteArrayInputStream ByteArrayOutputStream
    DataInputStream DataOutputStream]))
 ;;;; Interface
@ -11,24 +16,120 @@
  (compress   ^bytes [compressor ba])
  (decompress ^bytes [compressor ba]))
-;;;; Default implementations
+(def ^:const standard-header-ids
  "These support `:auto` thaw."
  #{:zstd :lz4 #_:lzo :lzma2 :snappy})
-(def standard-header-ids "These'll support :auto thaw" #{:snappy :lzma2 :lz4})
+;;;; Misc utils
-(deftype SnappyCompressor []
+(defn- int-size->ba ^bytes [size]
-  ICompressor
+  (let [ba   (byte-array 4)
-  (header-id  [_] :snappy)
+        baos (ByteArrayOutputStream. 4)
-  (compress   [_ ba] (org.iq80.snappy.Snappy/compress   ba))
+        dos  (DataOutputStream. baos)]
-  (decompress [_ ba] (org.iq80.snappy.Snappy/uncompress ba 0 (alength ^bytes ba))))
+    (.writeInt dos (int size))
    (.toByteArray baos)))
-(def snappy-compressor
+(defn- ba->int-size [ba]
-  "Default org.iq80.snappy.Snappy compressor:
+  (let [bais (ByteArrayInputStream. ba)
-        Ratio: low.
+        dis  (DataInputStream. bais)]
-  Write speed: very high.
+    (.readInt dis)))
   Read speed: very high.
-  A good general-purpose compressor."
+(comment (ba->int-size (int-size->ba 3737)))
-  (SnappyCompressor.))
+
 ;;;; Airlift
 (defn- airlift-compress
  ^bytes [^io.airlift.compress.Compressor c ^bytes ba prepend-size?]
  (let [in-len      (alength ba)
        max-out-len (.maxCompressedLength c in-len)]
    (if prepend-size?
      (let [ba-max-out  (byte-array (int (+ 4 max-out-len)))
            int-size-ba (int-size->ba in-len)
            _           (System/arraycopy int-size-ba 0 ba-max-out 0 4)
            out-len
            (.compress c
              ba         0 in-len
              ba-max-out 4 max-out-len)]
        (if (== out-len max-out-len)
          (do                           ba-max-out)
          (java.util.Arrays/copyOfRange ba-max-out 0 (+ 4 out-len))))
      (let [ba-max-out (byte-array max-out-len)
            out-len
            (.compress c
              ba         0 in-len
              ba-max-out 0 max-out-len)]
        (if (== out-len max-out-len)
          (do                           ba-max-out)
          (java.util.Arrays/copyOfRange ba-max-out 0 out-len))))))
 (defn- airlift-decompress
  ^bytes [^io.airlift.compress.Decompressor d ^bytes ba max-out-len]
  (if max-out-len
    (let [max-out-len (int        max-out-len)
          ba-max-out  (byte-array max-out-len)
          out-len
          (.decompress d
            ba         0 (alength ba)
            ba-max-out 0 max-out-len)]
      (if (== out-len max-out-len)
        (do                           ba-max-out)
        (java.util.Arrays/copyOfRange ba-max-out 0 out-len)))
    ;; Prepended size
    (let [out-len (ba->int-size ba)
          ba-out  (byte-array (int out-len))]
      (.decompress d
        ba     4 (- (alength ba) 4)
        ba-out 0 out-len)
      ba-out)))
 (do
  (enc/def* ^:private airlift-zstd-compressor_   (enc/thread-local (io.airlift.compress.zstd.ZstdCompressor.)))
  (enc/def* ^:private airlift-zstd-decompressor_ (enc/thread-local (io.airlift.compress.zstd.ZstdDecompressor.)))
  (deftype ZstdCompressor [prepend-size?]
    ICompressor
    (header-id  [_] :zstd)
    (compress   [_ ba] (airlift-compress   @airlift-zstd-compressor_   ba prepend-size?))
    (decompress [_ ba] (airlift-decompress @airlift-zstd-decompressor_ ba
                         (when-not prepend-size?
                           (io.airlift.compress.zstd.ZstdDecompressor/getDecompressedSize ba
                             0 (alength ^bytes ba)))))))
 (do
  (enc/def* ^:private airlift-lz4-compressor_   (enc/thread-local (io.airlift.compress.lz4.Lz4Compressor.)))
  (enc/def* ^:private airlift-lz4-decompressor_ (enc/thread-local (io.airlift.compress.lz4.Lz4Decompressor.)))
  (deftype LZ4Compressor []
    ICompressor
    (header-id  [_] :lz4)
    (compress   [_ ba] (airlift-compress   @airlift-lz4-compressor_   ba true))
    (decompress [_ ba] (airlift-decompress @airlift-lz4-decompressor_ ba nil))))
 (do
  (enc/def* ^:private airlift-lzo-compressor_   (enc/thread-local (io.airlift.compress.lzo.LzoCompressor.)))
  (enc/def* ^:private airlift-lzo-decompressor_ (enc/thread-local (io.airlift.compress.lzo.LzoDecompressor.)))
  (deftype LZOCompressor []
    ICompressor
    (header-id  [_] :lzo)
    (compress   [_ ba] (airlift-compress   @airlift-lzo-compressor_   ba true))
    (decompress [_ ba] (airlift-decompress @airlift-lzo-decompressor_ ba nil))))
 (do
  (enc/def* ^:private airlift-snappy-compressor_   (enc/thread-local (io.airlift.compress.snappy.SnappyCompressor.)))
  (enc/def* ^:private airlift-snappy-decompressor_ (enc/thread-local (io.airlift.compress.snappy.SnappyDecompressor.)))
  (deftype SnappyCompressor [prepend-size?]
    ICompressor
    (header-id  [_] :snappy)
    (compress   [_ ba] (airlift-compress   @airlift-snappy-compressor_   ba prepend-size?))
    (decompress [_ ba] (airlift-decompress @airlift-snappy-decompressor_ ba
                         (when-not prepend-size?
                           (io.airlift.compress.snappy.SnappyDecompressor/getUncompressedLength ba 0))))))
 ;;;; LZMA2
 (deftype LZMA2Compressor [compression-level]
  ;; Compression level ∈ℕ[0,9] (low->high) with 6 LZMA2 default (we use 0)
@ -57,86 +158,61 @@
      (.read xzs ba 0 len-decomp)
      (if (== -1 (.read xzs)) ; Good practice as extra safety measure
        nil
-        (throw (ex-info "LZMA2 Decompress failed: corrupt data?" {:ba ba})))
+        (truss/ex-info! "LZMA2 Decompress failed: corrupt data?" {:ba ba}))
      ba)))
-(def lzma2-compressor
+;;;; Public API
  "Default org.tukaani.xz.LZMA2 compressor:
        Ratio: high.
  Write speed: _very_ slow (also currently single-threaded).
   Read speed: slow.
-  A specialized compressor for large, low-write data in space-sensitive
+(def zstd-compressor
-  environments."
+  "Default `Zstd` (`Zstandard`) compressor:
    -   Compression ratio: `B` (0.53       on reference benchmark).
    -   Compression speed: `C` (1300 msecs on reference benchmark).
    - Decompression speed: `B` (400  msecs on reference benchmark).
  Good general-purpose compressor, balances ratio & speed.
  See `taoensso.nippy-benchmarks` for detailed comparative benchmarks."
  (ZstdCompressor. false))
 (def lz4-compressor
  "Default `LZ4` compressor:
    -   Compression ratio: `C`  (0.58      on reference benchmark).
    -   Compression speed: `A`  (240 msecs on reference benchmark).
    - Decompression speed: `A+` (30  msecs on reference benchmark).
  Good general-purpose compressor, favours speed.
  See `taoensso.nippy-benchmarks` for detailed comparative benchmarks."
  (LZ4Compressor.))
 (def lzo-compressor
  "Default `LZO` compressor:
    -   Compression ratio: `C` (0.58      on reference benchmark).
    -   Compression speed: `A` (220 msecs on reference benchmark).
    - Decompression speed: `A` (40  msecs on reference benchmark).
  Good general-purpose compressor, favours speed.
  See `taoensso.nippy-benchmarks` for detailed comparative benchmarks."
  (LZOCompressor.))
 (def lzma2-compressor
  "Default `LZMA2` compressor:
    -   Compression ratio: `A+` (0.4       on reference benchmark).
    -   Compression speed: `E`  (18.5 secs on reference benchmark).
    - Decompression speed: `D`  (12   secs on reference benchmark).
  Specialized compressor, strongly favours ratio.
  See `taoensso.nippy-benchmarks` for detailed comparative benchmarks."
  (LZMA2Compressor. 0))
-(deftype LZ4Compressor [compressor_ decompressor_]
+(enc/def* snappy-compressor
-  ICompressor
+  "Default `Snappy` compressor:
-  (header-id [_] :lz4)
+    -   Compression ratio: `C`  (0.58      on reference benchmark).
-  (compress  [_ ba]
+    -   Compression speed: `A+` (210 msecs on reference benchmark).
-    (let [^net.jpountz.lz4.LZ4Compressor compressor @compressor_
+    - Decompression speed: `B`  (130 msecs on reference benchmark).
-          len-decomp   (alength ^bytes ba)
+  Good general-purpose compressor, favours speed.
-          max-len-comp (.maxCompressedLength compressor len-decomp)
+  See `taoensso.nippy-benchmarks` for detailed comparative benchmarks."
-          ba-comp*     (byte-array max-len-comp) ; Over-sized
+  (SnappyCompressor. false))
          len-comp     (.compress compressor ^bytes ba 0 len-decomp
                         ba-comp* 0 max-len-comp)
          ;;
          baos (ByteArrayOutputStream. (+ len-comp 4))
          dos  (DataOutputStream. baos)]
      (.writeInt dos len-decomp) ; Prefix with uncompressed length
      (.write    dos ba-comp* 0 len-comp)
      (.toByteArray baos)))
-  (decompress [_ ba]
+(enc/def* ^:no-doc lz4hc-compressor
-    (let [^net.jpountz.lz4.LZ4Decompressor decompressor @decompressor_
+  "Different LZ4 modes no longer supported, prefer `lz4-compressor`."
-          bais (ByteArrayInputStream. ba)
+  {:deprecated "v3.4.0-RC1 (2024-02-06)"}
-          dis  (DataInputStream. bais)
+  (LZ4Compressor.))
          ;;
          len-decomp (.readInt dis)
          len-comp   (- (alength ^bytes ba) 4)
          ;; ba-comp (byte-array len-comp)
          ;; _       (.readFully dis ba-comp 0 len-comp)
          ba-decomp  (byte-array len-decomp)
          _          (.decompress decompressor ba 4 ba-decomp 0 len-decomp)]
      ba-decomp)))
 (def ^:private lz4-factory_ (delay (net.jpountz.lz4.LZ4Factory/fastestInstance)))
 (def lz4-compressor
  "Default net.jpountz.lz4 compressor:
        Ratio: low.
  Write speed: very high.
   Read speed: very high.
  A good general-purpose compressor, competitive with Snappy.
  Thanks to Max Penet (@mpenet) for our first implementation,
  Ref. https://github.com/mpenet/nippy-lz4"
  (LZ4Compressor.
    (delay (.fastCompressor   ^net.jpountz.lz4.LZ4Factory @lz4-factory_))
    (delay (.fastDecompressor ^net.jpountz.lz4.LZ4Factory @lz4-factory_))))
 (def lz4hc-compressor
  "Like `lz4-compressor` but trades some write speed for ratio."
  (LZ4Compressor.
    (delay (.highCompressor   ^net.jpountz.lz4.LZ4Factory @lz4-factory_))
    (delay (.fastDecompressor ^net.jpountz.lz4.LZ4Factory @lz4-factory_))))
 (comment
  (def ba-bench (.getBytes (apply str (repeatedly 1000 rand)) "UTF-8"))
  (defn bench1 [compressor]
    {:time  (enc/bench 10000 {:nlaps-warmup 10000}
              (->> ba-bench (compress compressor) (decompress compressor)))
     :ratio (enc/round2 (/ (count (compress compressor ba-bench))
                           (count ba-bench)))})
  (println
   {:snappy (bench1 snappy-compressor)
    ;:lzma2  (bench1 lzma2-compressor) ; Slow!
    :lz4    (bench1 lz4-compressor)
    :lz4hc  (bench1 lz4hc-compressor)})
  ;;; 2014 April 7
  {:snappy {:time 2251, :ratio 0.852},
   :lzma2  {:time 46684 :ratio 0.494}
   :lz4    {:time 1184, :ratio 0.819},
   :lz4hc  {:time 5422, :ratio 0.761}})
--- a/src/taoensso/nippy/crypto.clj
+++ b/src/taoensso/nippy/crypto.clj
@ -2,11 +2,13 @@
  "Low-level crypto utils.
  Private & alpha, very likely to change!"
  (:refer-clojure :exclude [rand-nth])
-  (:require [taoensso.encore :as enc]))
+  (:require
   [taoensso.truss  :as truss]
   [taoensso.encore :as enc]))
 ;; Note that AES128 may be preferable to AES256 due to known attack
-;; vectors specific to AES256, Ref. https://goo.gl/qU4CCV
+;; vectors specific to AES256, Ref. <https://goo.gl/qU4CCV>
-;;  or for a counter argument, Ref. https://goo.gl/9LA9Yb
+;;  or for a counter argument, Ref. <https://goo.gl/9LA9Yb>
 ;;;; Randomness
@ -45,7 +47,7 @@
 (defn   take-ba ^bytes [n ^bytes ba] (java.util.Arrays/copyOf ba ^int n)) ; Pads if ba too small
 (defn  utf8->ba ^bytes [^String s] (.getBytes s "UTF-8"))
 (defn- add-salt ^bytes [?salt-ba ba] (if ?salt-ba (enc/ba-concat ?salt-ba ba) ba))
-(defn pwd-as-ba ^bytes [utf8-or-ba] (if (string? utf8-or-ba) (utf8->ba utf8-or-ba) (enc/have enc/bytes? utf8-or-ba)))
+(defn pwd-as-ba ^bytes [utf8-or-ba] (if (string? utf8-or-ba) (utf8->ba utf8-or-ba) (truss/have enc/bytes? utf8-or-ba)))
 (comment (seq (pwd-as-ba "foo")))
@ -70,7 +72,7 @@
  (get-key-spec   ^javax.crypto.spec.SecretKeySpec           [_    ba] "Returns a `javax.crypto.spec.SecretKeySpec`.")
  (get-param-spec ^java.security.spec.AlgorithmParameterSpec [_ iv-ba] "Returns a `java.security.spec.AlgorithmParameters`."))
-;; Prefer GCM > CBC, Ref. https://goo.gl/jpZoj8
+;; Prefer GCM > CBC, Ref. <https://goo.gl/jpZoj8>
 (def ^:private gcm-cipher* (enc/thread-local-proxy (javax.crypto.Cipher/getInstance "AES/GCM/NoPadding")))
 (def ^:private cbc-cipher* (enc/thread-local-proxy (javax.crypto.Cipher/getInstance "AES/CBC/PKCS5Padding")))
--- a/src/taoensso/nippy/encryption.clj
+++ b/src/taoensso/nippy/encryption.clj
@ -1,13 +1,13 @@
 (ns ^:no-doc taoensso.nippy.encryption
  "Private, implementation detail."
  (:require
   [taoensso.truss        :as truss]
   [taoensso.encore       :as enc]
   [taoensso.nippy.crypto :as crypto]))
-(def standard-header-ids
+(def ^:const standard-header-ids
-  "These'll support `:auto` thaw."
+  "These support `:auto` thaw."
-  #{:aes128-cbc-sha512
+  #{:aes128-cbc-sha512 :aes128-gcm-sha512})
    :aes128-gcm-sha512})
 (defprotocol IEncryptor
  (header-id      [encryptor])
@ -15,11 +15,11 @@
  (decrypt ^bytes [encryptor pwd ba]))
 (defn- throw-destructure-ex [typed-password]
-  (throw (ex-info
+  (truss/ex-info!
-           (str "Expected password form: "
+    (str "Expected password form: "
-             "[<#{:salted :cached}> <password-string>].\n "
+      "[<#{:salted :cached}> <password-string>].\n "
-             "See `aes128-encryptor` docstring for details!")
+      "See `aes128-encryptor` docstring for details!")
-           {:typed-password typed-password})))
+    {:typed-password typed-password}))
 (defn- destructure-typed-pwd [typed-password]
  (if (vector? typed-password)
--- a/src/taoensso/nippy/impl.clj
+++ b/src/taoensso/nippy/impl.clj
@ -0,0 +1,273 @@
 (ns ^:no-doc taoensso.nippy.impl
  "Private, implementation detail."
  (:require
   [clojure.string  :as str]
   [taoensso.truss  :as truss]
   [taoensso.encore :as enc]))
 ;;;; Fallback type tests
 (defn cache-by-type [f]
  (let [cache_ (enc/latom {})] ; {<type> <result_>}
    (fn [x]
      (let [t (if (fn? x) ::fn (type x))]
        (if-let [result_ (get (cache_) t)]
          @result_
          (if-let [uncacheable-type? (re-find #"\d" (str t))]
            (do                      (f x))
            @(cache_ t #(or % (delay (f x))))))))))
 (def seems-readable?
  (cache-by-type
    (fn [x]
      (try
        (enc/read-edn (enc/pr-edn x))
        true
        (catch Throwable _ false)))))
 (def seems-serializable?
  (cache-by-type
    (fn [x]
      (enc/cond
        (fn? x) false ; Falsely reports as Serializable
        (instance? java.io.Serializable x)
        (try
          (let [c   (Class/forName (.getName (class x))) ; Try 1st (fail fast)
                bas (java.io.ByteArrayOutputStream.)
                _   (.writeObject (java.io.ObjectOutputStream. bas) x)
                ba  (.toByteArray bas)]
            #_
            (cast c
              (.readObject ; Unsafe + usu. unnecessary to check
                (ObjectInputStream. (ByteArrayInputStream. ba))))
            true)
          (catch Throwable _ false))
        :else false))))
 (comment
  (enc/qb 1e6 ; [60.83 61.16 59.86 57.37]
    (seems-readable?     "Hello world")
    (seems-serializable? "Hello world")
    (seems-readable?     (fn []))
    (seems-serializable? (fn []))))
 ;;;; Java Serializable
 (def ^:const ^:private allow-and-record          "allow-and-record")
 (defn-                 allow-and-record? [x] (= x allow-and-record))
 (defn- classname-set
  "Returns ?#{<classname>}."
  [x]
  (when x
    (if (string? x)
      (if (= x "") #{} (set (mapv str/trim (str/split x #"[,:]"))))
      (truss/have set? x))))
 (comment
  (mapv classname-set [nil #{"foo"} "" "foo, bar:baz"])
  (.getName (.getSuperclass (.getClass (java.util.concurrent.TimeoutException.)))))
 (defn parse-allowlist
  "Returns #{<classname>}, or `allow-and-record`."
  [default base add]
  (if (or
        (allow-and-record? base)
        (allow-and-record? add))
    allow-and-record
    (into
      (or (classname-set base) default)
      (do (classname-set add)))))
 (comment (parse-allowlist #{"default"} "base1,base2" "add1"))
 (let [nmax    1000
      ngc     16000
      state_  (enc/latom {})  ; {<class-name> <frequency>}
      lock_   (enc/latom nil) ; ?promise
      trim
      (fn [nmax state]
        (persistent!
          (enc/reduce-top nmax val enc/rcompare conj!
            (transient {}) state)))]
  ;; Note: trim strategy isn't perfect: it can be tough for new
  ;; classes to break into the top set since frequencies are being
  ;; reset only for classes outside the top set.
  ;;
  ;; In practice this is probably good enough since the main objective
  ;; is to discard one-off anonymous classes to protect state from
  ;; endlessly growing. Also `gc-rate` allows state to temporarily grow
  ;; significantly beyond `nmax` size, which helps to give new classes
  ;; some chance to accumulate a competitive frequency before next GC.
  (defn ^{:-state_ state_} ; Undocumented
    allow-and-record-any-serializable-class-unsafe
    "A predicate (fn allow-class? [class-name]) fn that can be assigned
    to `*freeze-serializable-allowlist*` and/or
         `*thaw-serializable-allowlist*` that:
      - Will allow ANY class to use Nippy's `Serializable` support (unsafe).
      - And will record {<class-name> <frequency-allowed>} for the <=1000
        classes that ~most frequently made use of this support.
    `get-recorded-serializable-classes` returns the recorded state.
    This predicate is provided as a convenience for users upgrading from
    previous versions of Nippy that allowed the use of `Serializable` for all
    classes by default.
    While transitioning from an unsafe->safe configuration, you can use
    this predicate (unsafe) to record information about which classes have
    been using Nippy's `Serializable` support in your environment.
    Once some time has passed, you can check the recorded state. If you're
    satisfied that all recorded classes are safely `Serializable`, you can
    then merge the recorded classes into Nippy's default allowlist/s, e.g.:
    (alter-var-root #'thaw-serializable-allowlist*
      (fn [_] (into default-thaw-serializable-allowlist
                (keys (get-recorded-serializable-classes)))))"
    [class-name]
    (when-let [p (lock_)] @p)
    (let [n (count (state_ #(assoc % class-name (inc (long (or (get % class-name) 0))))))]
      ;; Garbage collection (GC): may be serializing anonymous classes, etc.
      ;; so input domain could be infinite
      (when (> n ngc) ; Too many classes recorded, uncommon
        (let [p (promise)]
          (when (compare-and-set! lock_ nil p) ; Acquired GC lock
            (try
              (do      (reset! state_ (trim nmax (state_)))) ; GC state
              (finally (reset! lock_  nil) (deliver p nil))))))
      n))
  (defn get-recorded-serializable-classes
    "Returns {<class-name> <frequency>} of the <=1000 classes that ~most
    frequently made use of Nippy's `Serializable` support via
    `allow-and-record-any-serializable-class-unsafe`.
    See that function's docstring for more info."
    [] (trim nmax (state_))))
 (comment
  (count (get-recorded-serializable-classes))
  (enc/reduce-n
    (fn [_ n] (allow-and-record-any-serializable-class-unsafe (str n)))
    nil 0 1e5))
 (let [compile
      (enc/fmemoize
        (fn [x]
          (if (allow-and-record? x)
            allow-and-record-any-serializable-class-unsafe
            (enc/name-filter x))))
      fn? fn?
      conform?
      (fn [x cn]
        (if (fn? x)
          (x cn) ; Intentionally uncached, can be handy
          ((compile x) cn)))]
  (defn serializable-allowed? [allow-list class-name]
    (conform? allow-list class-name)))
 ;;;; Release targeting
 (comment
  (set! *print-length* nil)
  (vec (sort (keys taoensso.nippy/public-types-spec)))
  ;; To help support release targeting, we track new type ids added over time
  (let [id-history ; {<release> #{type-ids}}
        {350 ; v3.5.0 (2025-04-15), added 5x
         ;; #{int-array-lg long-array-lg float-array-lg double-array-lg string-array-lg}
         #{0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
           29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
           55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
           81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104
           105 106 107 108 109 110 111 112 113 114 115 116 117}
         340 ; v3.4.0 (2024-04-30), added 2x
         ;; #{map-entry meta-protocol-key}
         #{0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
           29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
           55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
           81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104
           105 106 110 111 112 113 114 115}
         330 ; v3.3.0 (2023-10-11), added 11x
         ;; #{long-pos-sm long-pos-md long-pos-lg long-neg-sm long-neg-md long-neg-lg
         ;;   str-sm* vec-sm* set-sm* map-sm* sql-date}
         #{0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
           29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
           55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
           81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 105 106
           110 111 112 113 114 115}
         320 ; v3.2.0 (2022-07-18), added none
         #{0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
           29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
           55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
           81 82 83 84 85 86 90 91 100 101 102 105 106 110 111 112 113 114 115}
         313 ; v3.1.3 (2022-06-23), added 5x
         ;; #{time-instant time-duration time-period kw-md sym-md}
         #{0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
           29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
           55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
           81 82 83 84 85 86 90 91 100 101 102 105 106 110 111 112 113 114 115}
         300 ; v3.0.0 (2020-09-20), baseline
         #{0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
           29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
           55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 80
           81 82 90 91 100 101 102 105 106 110 111 112 113 114 115}}
        diff
        (fn [new-release old-release]
          (vec (sort (clojure.set/difference (id-history new-release) (id-history old-release)))))]
    (diff 350 340)))
 (let [target-release
      (enc/get-env {:as :edn, :default 320}
        :taoensso.nippy.target-release)
      target>=
      (fn [min-release]
        (if target-release
          (>= (long target-release) (long min-release))
          true))]
  (defmacro target-release< [min-release] (not (target>= min-release)))
  (defmacro target-release>=
    "Returns true iff `target-release` is nil or >= given `min-release`.
    Used to help ease data migration for changes to core data types.
    When support is added for a new type in Nippy version X, it necessarily means
    that data containing that new type and frozen with Nippy version X is unthawable
    with Nippy versions < X.
    Earlier versions of Nippy will throw an exception on thawing affected data:
      \"Unrecognized type id (<n>). Data frozen with newer Nippy version?\"
    This can present a challenge when updating to new versions of Nippy, e.g.:
      - Rolling updates could lead to old and new versions of Nippy temporarily co-existing.
      - Data written with new types could limit your ability to revert a Nippy update.
    There's no easy solution to this in GENERAL, but we CAN at least help reduce the
    burden related to CHANGES in core data types by introducing changes over 2 phases:
      1. Nippy vX   reads  new (changed) type, writes old type
      2. Nippy vX+1 writes new (changed) type
    When relevant, we can then warn users in the CHANGELOG to not leapfrog
    (e.g. Nippy vX -> Nippy vX+2) when doing rolling updates."
    [min-release] (target>= min-release)))
 (comment (macroexpand '(target-release>= 340)))
--- a/src/taoensso/nippy/tools.clj
+++ b/src/taoensso/nippy/tools.clj
@ -1,45 +1,40 @@
 (ns taoensso.nippy.tools
  "Utils for community tools that want to add user-configurable Nippy support.
  Used by Carmine, Faraday, etc."
-  (:require [taoensso.nippy :as nippy]))
+  (:require
   [taoensso.encore :as enc]
   [taoensso.nippy  :as nippy]))
 (def ^:dynamic *freeze-opts* nil)
 (def ^:dynamic *thaw-opts*   nil)
 (defn ^:no-doc -merge-opts
  "Private, implementation detail."
  ([x y  ] (if x (conj x y) y))
  ([x y z] (-merge-opts (-merge-opts x y) z)))
 (do
-  (defmacro with-freeze-opts  [opts & body] `(binding [*freeze-opts*                            ~opts ] ~@body))
+  (defmacro with-freeze-opts  [opts & body] `(binding [*freeze-opts*                          ~opts ] ~@body))
-  (defmacro with-freeze-opts+ [opts & body] `(binding [*freeze-opts* (-merge-opts *freeze-opts* ~opts)] ~@body))
+  (defmacro with-freeze-opts+ [opts & body] `(binding [*freeze-opts* (enc/merge *freeze-opts* ~opts)] ~@body))
-  (defmacro with-thaw-opts    [opts & body] `(binding [*thaw-opts*                              ~opts ] ~@body))
+  (defmacro with-thaw-opts    [opts & body] `(binding [*thaw-opts*                            ~opts ] ~@body))
-  (defmacro with-thaw-opts+   [opts & body] `(binding [*thaw-opts*   (-merge-opts *thaw-opts*   ~opts)] ~@body)))
+  (defmacro with-thaw-opts+   [opts & body] `(binding [*thaw-opts*   (enc/merge *thaw-opts*   ~opts)] ~@body)))
 (deftype WrappedForFreezing [val opts])
 (defn wrapped-for-freezing? [x] (instance? WrappedForFreezing x))
-(let [-merge-opts -merge-opts]
+(defn wrap-for-freezing
-  (defn wrap-for-freezing
+  "Captures (merge `tools/*thaw-opts*` `wrap-opts`), and returns
    "Captures (merge `tools/*thaw-opts*` `wrap-opts`), and returns
    the given argument in a wrapped form so that `tools/freeze` will
    use the captured options when freezing the wrapper argument.
    See also `tools/freeze`."
-    ([x          ] (wrap-for-freezing x nil))
+  ([x          ] (wrap-for-freezing x nil))
-    ([x wrap-opts]
+  ([x wrap-opts]
-     (let [captured-opts (-merge-opts *freeze-opts* wrap-opts)] ; wrap > dynamic
+   (let [captured-opts (enc/merge *freeze-opts* wrap-opts)] ; wrap > dynamic
-       (if (instance? WrappedForFreezing x)
+     (if (instance? WrappedForFreezing x)
-         (let [^WrappedForFreezing x x]
+       (let [^WrappedForFreezing x x]
-           (if (= (.-opts x) captured-opts)
+         (if (= (.-opts x) captured-opts)
-             x
+           x
-             (WrappedForFreezing. (.-val x) captured-opts)))
+           (WrappedForFreezing. (.-val x) captured-opts)))
-         (WrappedForFreezing.            x  captured-opts))))))
+       (WrappedForFreezing.            x  captured-opts)))))
-(let [-merge-opts -merge-opts]
+(defn freeze
-  (defn freeze
+  "Like `nippy/freeze` but uses as options the following, merged in
    "Like `nippy/freeze` but uses as options the following, merged in
    order of ascending preference:
      1. `default-opts` given to this fn            (default nil).
@ -47,28 +42,27 @@
      3. Opts captured by `tools/wrap-for-freezing` (default nil).
    See also `tools/wrap-for-freezing`."
-    ([x             ] (freeze x nil))
+  ([x             ] (freeze x nil))
-    ([x default-opts]
+  ([x default-opts]
-     (let [default-opts (get default-opts :default-opts default-opts) ; Back compatibility
+   (let [default-opts (get       default-opts :default-opts default-opts) ; Back compatibility
-           active-opts  (-merge-opts default-opts *freeze-opts*)] ; dynamic > default
+         active-opts  (enc/merge default-opts *freeze-opts*)] ; dynamic > default
-       (if (instance? WrappedForFreezing x)
+     (if (instance? WrappedForFreezing x)
-         (let [^WrappedForFreezing x x]
+       (let [^WrappedForFreezing x x]
-           (nippy/freeze (.-val x) (-merge-opts active-opts (.-opts x)))) ; captured > active!
+         (nippy/freeze (.-val x) (enc/merge active-opts (.-opts x)))) ; captured > active!
-         (nippy/freeze          x               active-opts))))))
+       (nippy/freeze          x             active-opts)))))
-(let [-merge-opts -merge-opts]
+(defn thaw
-  (defn thaw
+  "Like `nippy/thaw` but uses as options the following, merged in
    "Like `nippy/thaw` but uses as options the following, merged in
    order of ascending preference:
      1. `default-opts` given to this fn   (default nil).
      2. `tools/*thaw-opts*` dynamic value (default nil)."
-    ([ba             ] (thaw ba nil))
+  ([ba             ] (thaw ba nil))
-    ([ba default-opts]
+  ([ba default-opts]
-     (let [default-opts (get default-opts :default-opts default-opts) ; Back compatibility
+   (let [default-opts (get       default-opts :default-opts default-opts) ; Back compatibility
-           active-opts  (-merge-opts default-opts *thaw-opts*)] ; dynamic > default
+         active-opts  (enc/merge default-opts *thaw-opts*)] ; dynamic > default
-       (nippy/thaw ba active-opts)))))
+     (nippy/thaw ba active-opts))))
 (comment (thaw (freeze (wrap-for-freezing "wrapped"))))
--- a/src/taoensso/nippy/utils.clj
+++ b/src/taoensso/nippy/utils.clj
@ -1,144 +0,0 @@
 (ns ^:no-doc taoensso.nippy.utils
  "Private, implementation detail."
  (:require [clojure.string  :as str]
            [taoensso.encore :as enc])
  (:import  [java.io ByteArrayInputStream ByteArrayOutputStream Serializable
             ObjectOutputStream ObjectInputStream]))
 ;;;; Fallback type tests
 ;; Unfortunately the only ~reliable way we can tell if something's
 ;; really serializable/readable is to actually try a full roundtrip.
 (let [swap-cache! enc/-swap-val!]
  (defn- memoize-type-test [test-fn]
    (let [cache (atom {})] ; {<type> <type-okay?>}
      (fn [x]
        (let [t (type x)
              ;; This is a bit hackish, but no other obvious solutions (?):
              cacheable? (not (re-find #"__\d+" (str t))) ; gensym form
              test (fn [] (try (test-fn x) (catch Exception _ false)))]
          (if cacheable?
            @(swap-cache! cache t #(if % % (delay (test))))
            (test)))))))
 (def     readable? (memoize-type-test (fn [x] (-> x enc/pr-edn enc/read-edn) true)))
 (def serializable?
  (let [mtt
        (memoize-type-test
          (fn [x]
            (let [class-name (.getName (class x))
                  c   (Class/forName class-name) ; Try 1st (fail fast)
                  bas (ByteArrayOutputStream.)
                  _   (.writeObject (ObjectOutputStream. bas) x)
                  ba  (.toByteArray bas)]
              #_
              (cast c
                (.readObject ; Unsafe + usu. unnecessary to check
                  (ObjectInputStream.
                    (ByteArrayInputStream. ba))))
              true)))]
    (fn [x]
      (if (instance? Serializable x)
        (if (fn? x)
          false ; Reports as true but is unreliable
          (mtt x))
       false))))
 (comment
  (enc/qb 1e4
    (readable?     "Hello world") ; Cacheable
    (serializable? "Hello world") ; Cacheable
    (readable?     (fn []))       ; Uncacheable
    (serializable? (fn []))       ; Uncacheable
    )) ; [5.65 5.88 1129.46 1.4]
 ;;;;
 (defn- is-coll?
  "Checks for _explicit_ IPersistentCollection types with Nippy support.
  Checking for explicit concrete types is tedious but preferable since a
  `freezable?` false positive would be much worse than a false negative."
  [x]
  (let [is? #(when (instance? % x) %)]
    (or
     (is? clojure.lang.APersistentVector)
     (is? clojure.lang.APersistentMap)
     (is? clojure.lang.APersistentSet)
     (is? clojure.lang.PersistentList)
     (is? clojure.lang.PersistentList$EmptyList) ; (type '())
     (is? clojure.lang.PersistentQueue)
     (is? clojure.lang.PersistentTreeSet)
     (is? clojure.lang.PersistentTreeMap)
     (is? clojure.lang.PersistentVector$ChunkedSeq)
     (is? clojure.lang.IRecord) ; TODO Possible to avoid the interface check?
     (is? clojure.lang.LazySeq)
     ;; Too non-specific: could result in false positives (which would be a
     ;; serious problem here):
     ;; (is? clojure.lang.ISeq)
     )))
 (comment (is-coll? (clojure.lang.PersistentVector$ChunkedSeq. [1 2 3] 0 0)))
 (defmacro ^:private is? [x c] `(when (instance? ~c ~x) ~c))
 (defn freezable?
  "Alpha - subject to change.
  Returns truthy iff Nippy *appears* to support freezing the given argument.
  `:allow-clojure-reader?` and `:allow-java-serializable?` options may be
  used to enable the relevant roundtrip fallback test(s). These tests are
  only **moderately reliable** since they're cached by arg type and don't
  test for pre/post serialization value equality (there's no good general
  way of doing so)."
  ;; TODO Not happy with this approach in general, could do with a refactor.
  ;; Maybe return true/false/nil (nil => maybe)?
  ([x] (freezable? x nil))
  ([x {:keys [allow-clojure-reader? allow-java-serializable?]}]
   (if (is-coll? x)
     (when (enc/revery? freezable? x) (type x))
     (or
       (is? x clojure.lang.Keyword)
       (is? x java.lang.String)
       (is? x java.lang.Long)
       (is? x java.lang.Double)
       (nil? x)
       (is? x clojure.lang.BigInt)
       (is? x clojure.lang.Ratio)
       (is? x java.lang.Boolean)
       (is? x java.lang.Integer)
       (is? x java.lang.Short)
       (is? x java.lang.Byte)
       (is? x java.lang.Character)
       (is? x java.math.BigInteger)
       (is? x java.math.BigDecimal)
       (is? x #=(java.lang.Class/forName "[B"))
       (is? x clojure.lang.Symbol)
       (is? x java.util.Date)
       (is? x java.util.UUID)
       (is? x java.util.regex.Pattern)
       (when (and allow-clojure-reader?    (readable?     x)) :clojure-reader)
       (when (and allow-java-serializable? (serializable? x)) :java-serializable)))))
 (comment
  (enc/qb 10000 (freezable? "hello")) ; 0.79
  (freezable? [:a :b])
  (freezable? [:a (fn [x] (* x x))])
  (freezable? (.getBytes "foo"))
  (freezable? (java.util.Date.) {:allow-clojure-reader?    true})
  (freezable? (Exception. "_")  {:allow-clojure-reader?    true})
  (freezable? (Exception. "_")  {:allow-java-serializable? true})
  (freezable? (atom {}) {:allow-clojure-reader?    true
                         :allow-java-serializable? true}))
--- a/test/taoensso/nippy/tests/main.clj
+++ b/test/taoensso/nippy/tests/main.clj
@ -1,363 +0,0 @@
 (ns taoensso.nippy.tests.main
  (:require
   [clojure.test :as test :refer [deftest testing is]]
   [clojure.test.check            :as tc]
   [clojure.test.check.generators :as tc-gens]
   [clojure.test.check.properties :as tc-props]
   [taoensso.encore :as enc   :refer []]
   [taoensso.nippy  :as nippy :refer [freeze thaw]]
   [taoensso.nippy.benchmarks :as benchmarks]))
 (comment (test/run-tests))
 (def test-data nippy/stress-data-comparable)
 (def tc-num-tests 120)
 (def tc-gens
  "Like `tc-gens/any` but removes NaN (which breaks equality tests)"
  (tc-gens/recursive-gen tc-gens/container-type #_simple-type
    (tc-gens/one-of
      [tc-gens/int tc-gens/large-integer #_tc-gens/double
       (tc-gens/double* {:NaN? false})
       tc-gens/char tc-gens/string tc-gens/ratio tc-gens/boolean tc-gens/keyword
       tc-gens/keyword-ns tc-gens/symbol tc-gens/symbol-ns tc-gens/uuid])))
 (comment (tc-gens/sample tc-gens 10))
 ;;;; Core
 (deftest _core
  (is (do (println (str "Clojure version: " *clojure-version*)) true))
  (is (= test-data ((comp thaw freeze) test-data)))
  (is (= test-data ((comp #(thaw   % {:no-header? true
                                      :compressor nippy/lz4-compressor
                                      :encryptor  nil})
                          #(freeze % {:no-header? true}))
                    test-data)))
  (is (= test-data ((comp #(thaw   % {:password [:salted "p"]})
                          #(freeze % {:password [:salted "p"]}))
                    test-data)))
  (is (= (vec (:objects nippy/stress-data))
         ((comp vec thaw freeze) (:objects nippy/stress-data))))
  (is (= test-data ((comp #(thaw   % {:compressor nippy/lzma2-compressor})
                          #(freeze % {:compressor nippy/lzma2-compressor}))
                    test-data)))
  (is (= test-data ((comp #(thaw   % {:compressor nippy/lzma2-compressor
                                      :password [:salted "p"]})
                          #(freeze % {:compressor nippy/lzma2-compressor
                                      :password [:salted "p"]}))
                    test-data)))
  (is (= test-data ((comp #(thaw   % {:compressor nippy/lz4-compressor})
                          #(freeze % {:compressor nippy/lz4hc-compressor}))
                    test-data)))
  (is ; Try roundtrip anything that simple-check can dream up
    (:result (tc/quick-check tc-num-tests
               (tc-props/for-all [val tc-gens]
                 (= val (thaw (freeze val)))))))
  (is (thrown? Exception (thaw (freeze test-data {:password "malformed"}))))
  (is (thrown? Exception (thaw (freeze test-data {:password [:salted "p"]})
                           {;; Necessary to prevent against JVM segfault due to
                            ;; https://goo.gl/t0OUIo:
                            :v1-compatibility? false})))
  (is (thrown? Exception (thaw (freeze test-data {:password [:salted "p"]})
                           {:v1-compatibility? false ; Ref. https://goo.gl/t0OUIo
                            :compressor nil})))
  (is ; Snappy lib compatibility (for legacy versions of Nippy)
    (let [^bytes raw-ba    (freeze test-data {:compressor nil})
          ^bytes xerial-ba (org.xerial.snappy.Snappy/compress raw-ba)
          ^bytes iq80-ba   (org.iq80.snappy.Snappy/compress   raw-ba)]
      (= (thaw raw-ba)
        (thaw (org.xerial.snappy.Snappy/uncompress xerial-ba))
        (thaw (org.xerial.snappy.Snappy/uncompress iq80-ba))
        (thaw (org.iq80.snappy.Snappy/uncompress   iq80-ba    0 (alength iq80-ba)))
        (thaw (org.iq80.snappy.Snappy/uncompress   xerial-ba  0 (alength xerial-ba))))))
  (is ; CBC auto-encryptor compatibility
    (= "payload"
      (thaw (freeze "payload" {:password [:salted "pwd"] :encryptor nippy/aes128-cbc-encryptor})
        (do                   {:password [:salted "pwd"]})))))
 ;;;; Custom types & records
 (deftype   MyType [basic_field fancy-field!]) ; Note `fancy-field!` field name will be munged
 (defrecord MyRec  [basic_field fancy-field!])
 (deftest _types
  (testing "Extend to custom type"
    (is
      (thrown? Exception ; No thaw extension yet
        (do
          (alter-var-root #'nippy/*custom-readers* (constantly {}))
          (nippy/extend-freeze MyType 1 [x s]
            (.writeUTF s (.basic_field  x))
            (.writeUTF s (.fancy-field! x)))
          (thaw (freeze (MyType. "basic" "fancy"))))))
    (is
      (do
        (nippy/extend-thaw 1 [s] (MyType. (.readUTF s) (.readUTF s)))
        (let [mt1 (MyType. "basic" "fancy")
              ^MyType mt2 (thaw (freeze mt1))]
          (=
            [(.basic_field mt1) (.fancy-field! mt1)]
            [(.basic_field mt2) (.fancy-field! mt2)])))))
  (testing "Extend to custom Record"
    (is
      (do
        (nippy/extend-freeze MyRec 2 [x s]
          (.writeUTF s (str "foo-" (:basic_field  x)))
          (.writeUTF s (str "foo-" (:fancy-field! x))))
        (nippy/extend-thaw 2 [s] (MyRec. (.readUTF s) (.readUTF s)))
        (=
          (do           (MyRec. "foo-basic" "foo-fancy"))
          (thaw (freeze (MyRec.     "basic"     "fancy")))))))
  (testing "Keyword (prefixed) extensions"
    (is
      (do
        (nippy/extend-freeze MyRec :nippy-tests/MyRec [x s]
          (.writeUTF s (:basic_field  x))
          (.writeUTF s (:fancy-field! x)))
        (nippy/extend-thaw :nippy-tests/MyRec [s] (MyRec. (.readUTF s) (.readUTF s)))
        (let [mr (MyRec. "basic" "fancy")]
          (=  mr (thaw (freeze mr))))))))
 ;;;; Caching
 (deftest _caching
  (let [stress [nippy/stress-data-comparable
                nippy/stress-data-comparable
                nippy/stress-data-comparable
                nippy/stress-data-comparable]
        cached (mapv nippy/cache stress)
        cached (mapv nippy/cache stress) ; <=1 wrap auto-enforced
        ]
    (is (= stress (thaw (freeze stress {:compressor nil}))))
    (is (= stress (thaw (freeze cached {:compressor nil}))))
    (let [size-stress (count (freeze stress {:compressor nil}))
          size-cached (count (freeze cached {:compressor nil}))]
      (is (>= size-stress (* 3 size-cached)))
      (is (<  size-stress (* 4 size-cached))))))
 (deftest _caching-metadata
  (let [v1 (with-meta [] {:id :v1})
        v2 (with-meta [] {:id :v2})
        frozen-without-caching (freeze [v1 v2 v1 v2])
        frozen-with-caching
        (freeze [(nippy/cache v1)
                 (nippy/cache v2)
                 (nippy/cache v1)
                 (nippy/cache v2)])]
    (is (> (count frozen-without-caching)
           (count frozen-with-caching)))
    (is (= (thaw frozen-without-caching)
           (thaw frozen-with-caching)))
    (is (= (mapv meta (thaw frozen-with-caching))
           [{:id :v1} {:id :v2} {:id :v1} {:id :v2}]))))
 ;;;; Stable binary representation of vals
 (deftest _stable-bin
  (is (= (seq (freeze test-data))
         (seq (freeze test-data)))) ; f(x)=f(y) | x=y
  ;; As above, but try multiple times to catch possible protocol interface races:
  (is (every? true?
        (repeatedly 1000 (fn [] (= (seq (freeze test-data))
                                  (seq (freeze test-data)))))))
  ;; NB abandoning - no way to do this reliably w/o appropriate contracts from
  ;; (seq <unordered-coll>):
  ;;
  ;; (is (=  (seq (-> test-data freeze))
  ;;         (seq (-> test-data freeze thaw freeze)))) ; f(x)=f(f-1(f(x)))
  ;;
  ;; As above, but with repeated refreeze to catch possible protocol interface races:
  ;; (is (= (seq (freeze test-data))
  ;;        (seq (reduce (fn [frozen _] (freeze (thaw frozen)))
  ;;               (freeze test-data) (range 1000)))))
  )
 (defn qc-prop-bijection [& [n]]
  (let [bin->val (atom {})
        val->bin (atom {})]
    (merge
      (tc/quick-check (or n 1)
        (tc-props/for-all [val tc-gens]
          (let [;; Nb need `seq` for Clojure hash equality:
                bin (hash (seq (freeze val)))]
            (and
              (if (contains? val->bin val)
                (= (get val->bin val) bin) ; x=y => f(x)=f(y) by clj=
                (do (swap! val->bin assoc val bin)
                    true))
              (if (contains? bin->val bin)
                (= (get bin->val bin) val) ; f(x)=f(y) => x=y by clj=
                (do (swap! bin->val assoc bin val)
                    true))))))
      #_{:bin->val @bin->val
         :val->bin @val->bin}
      nil)))
 (comment
  (tc-gens/sample tc-gens 10)
  (:result (qc-prop-bijection 80))
  (let [{:keys [result bin->val val->bin]} (qc-prop-bijection 10)]
    [result (vals bin->val)]))
 (deftest _gc-prop-bijection
  (is (:result (qc-prop-bijection tc-num-tests))))
 ;;;; Thread safety
 (deftest _thread-safe
  (is
    (let [futures
          (mapv
            (fn [_]
              (future
                (= (thaw (freeze test-data)) test-data)))
            (range 50))]
      (every? deref futures)))
  (is
    (let [futures
          (mapv
            (fn [_]
              (future
                (= (thaw (freeze test-data {:password [:salted "password"]})
                                           {:password [:salted "password"]})
                  test-data)))
            (range 50))]
      (every? deref futures)))
  (is
    (let [futures
          (mapv
            (fn [_]
              (future
                (= (thaw (freeze test-data {:password [:cached "password"]})
                                           {:password [:cached "password"]})
                  test-data)))
            (range 50))]
      (every? deref futures))))
 ;;;; Redefs
 (defrecord MyFoo [] Object (toString [_] "v1"))
 (str (thaw (freeze (MyFoo.))))
 (defrecord MyFoo [] Object (toString [_] "v2"))
 (deftest _redefs
  (is (= (str (thaw (freeze (MyFoo.)))) "v2")))
 ;;;; Serializable
 (do
  (def ^:private semcn              "java.util.concurrent.Semaphore")
  (def ^:private sem                (java.util.concurrent.Semaphore. 1))
  (defn-         sem? [x] (instance? java.util.concurrent.Semaphore x)))
 (deftest _serializable
  (is (= nippy/*thaw-serializable-allowlist* #{"base.1" "base.2" "add.1" "add.2"})
    "JVM properties override initial allowlist values")
  (is (thrown? Exception (nippy/freeze sem {:serializable-allowlist #{}}))
    "Can't freeze Serializable objects unless approved by allowlist")
  (is (sem?
        (nippy/thaw
          (nippy/freeze sem {:serializable-allowlist #{semcn}})
          {:serializable-allowlist #{semcn}}))
    "Can freeze and thaw Serializable objects if approved by allowlist")
  (is (sem?
        (nippy/thaw
          (nippy/freeze sem {:serializable-allowlist #{"java.util.concurrent.*"}})
          {:serializable-allowlist #{"java.util.concurrent.*"}}))
    "Strings in allowlist sets may contain \"*\" wildcards")
  (let [ba     (nippy/freeze sem #_{:serializable-allowlist "*"})
        thawed (nippy/thaw   ba    {:serializable-allowlist #{}})]
    (is (= :quarantined (get-in thawed [:nippy/unthawable :cause]))
      "Serializable objects will be quarantined when approved for freezing but not thawing.")
    (is (sem? (nippy/read-quarantined-serializable-object-unsafe! thawed))
      "Quarantined Serializable objects can still be manually force-read.")
    (is (sem? (nippy/read-quarantined-serializable-object-unsafe!
                (nippy/thaw (nippy/freeze thawed))))
      "Quarantined Serializable objects are themselves safely transportable."))
  (let [obj
        (nippy/thaw
          (nippy/freeze sem)
          {:serializable-allowlist "allow-and-record"})]
    (is (sem? obj)
      "Special \"allow-and-record\" allowlist permits any class")
    (is
      (contains? (nippy/get-recorded-serializable-classes) semcn)
      "Special \"allow-and-record\" allowlist records classes")))
 ;;;; Metadata
 (deftest _metadata
  (is
    (:has-meta?
     (meta
       (nippy/thaw
         (nippy/freeze (with-meta [] {:has-meta? true}) {:incl-metadata? true})
         {:incl-metadata? true}
         )))
    "Metadata successfully included")
  (is
    (nil?
      (meta
        (nippy/thaw
          (nippy/freeze (with-meta [] {:has-meta? true}) {:incl-metadata? true})
          {:incl-metadata? false}
          )))
    "Metadata successfully excluded by thaw")
  (is
    (nil?
      (meta
        (nippy/thaw
          (nippy/freeze (with-meta [] {:has-meta? true}) {:incl-metadata? false})
          {:incl-metadata? true}
          )))
    "Metadata successfully excluded by freeze"))
 ;;;; Benchmarks
 (deftest _benchmarks
  (is (benchmarks/bench {})) ; Also tests :cached passwords
  )
--- a/test/taoensso/nippy_benchmarks.clj
+++ b/test/taoensso/nippy_benchmarks.clj
@ -0,0 +1,207 @@
 (ns taoensso.nippy-benchmarks
  (:require
   [clojure.data.fressian      :as fress]
   [taoensso.encore            :as enc]
   [taoensso.nippy             :as nippy]
   [taoensso.nippy.compression :as compr]))
 ;;;; Reader
 (defn- freeze-reader [x]   (enc/pr-edn   x))
 (defn- thaw-reader   [edn] (enc/read-edn edn))
 ;;;; Fressian
 (defn- freeze-fress [x]
  (let [^java.nio.ByteBuffer bb (fress/write x)
        len (.remaining bb)
        ba  (byte-array len)]
    (.get bb ba 0 len)
    (do      ba)))
 (defn- thaw-fress [^bytes ba]
  (let [bb (java.nio.ByteBuffer/wrap ba)]
    (fress/read bb)))
 (comment (-> data freeze-fress thaw-fress))
 ;;;; Bench data
 (def default-bench-data
  "Subset of stress data suitable for benching."
  (let [sd (nippy/stress-data {:comparable? true})]
    (reduce-kv
      (fn [m k v]
        (try
          (-> v freeze-reader thaw-reader)
          (-> v freeze-fress  thaw-fress)
          m
          (catch Throwable _ (dissoc m k))))
      sd sd)))
 (comment
  (clojure.set/difference
    (set (keys (nippy/stress-data {:comparable? true})))
    (set (keys default-bench-data))))
 ;;;;  Serialization
 (defn- bench1-serialization
  [freezer thawer sizer
   {:keys [laps warmup bench-data]
    :or
    {laps       1e4
     warmup     25e3
     bench-data default-bench-data}}]
  (let [data-frozen                                       (freezer bench-data)
        time-freeze (enc/bench laps {:warmup-laps warmup} (freezer bench-data))
        time-thaw   (enc/bench laps {:warmup-laps warmup} (thawer  data-frozen))
        data-size   (sizer data-frozen)]
    {:round (+ time-freeze time-thaw)
     :freeze   time-freeze
     :thaw                 time-thaw
     :size  data-size}))
 (comment (bench1-serialization nippy/freeze nippy/thaw count {}))
 (defn- printed-results [results]
  (println "\nBenchmark results:")
  (doseq [[k v] results] (println k " " v))
  (do           results))
 (defn bench-serialization
  [{:keys [all? reader? fressian? fressian? lzma2? laps warmup bench-data]
    :as   opts
    :or
    {laps   1e4
     warmup 25e3}}]
  (println "\nRunning benchmarks...")
  (let [results_ (atom {})]
    (when (or all? reader?)
      (println "  With Reader...")
      (swap! results_ assoc :reader
        (bench1-serialization freeze-reader thaw-reader
          (fn [^String s] (count (.getBytes s "UTF-8")))
          (assoc opts :laps laps, :warmup warmup))))
    (when (or all? fressian?)
      (println "  With Fressian...")
      (swap! results_ assoc :fressian
        (bench1-serialization freeze-fress thaw-fress count
          (assoc opts :laps laps, :warmup warmup))))
    (when (or all? lzma2?)
      (println "  With Nippy/LZMA2...")
      (swap! results_ assoc :nippy/lzma2
        (bench1-serialization
          #(nippy/freeze % {:compressor nippy/lzma2-compressor})
          #(nippy/thaw   % {:compressor nippy/lzma2-compressor})
          count
          (assoc opts :laps laps, :warmup warmup))))
    (println "  With Nippy/encrypted...")
    (swap! results_ assoc :nippy/encrypted
      (bench1-serialization
        #(nippy/freeze % {:password [:cached "p"]})
        #(nippy/thaw   % {:password [:cached "p"]})
        count
        (assoc opts :laps laps, :warmup warmup)))
    (println "  With Nippy/default...")
    (swap! results_ assoc :nippy/default
      (bench1-serialization nippy/freeze nippy/thaw count
        (assoc opts :laps laps, :warmup warmup)))
    (println "  With Nippy/fast...")
    (swap! results_ assoc :nippy/fast
      (bench1-serialization nippy/fast-freeze nippy/fast-thaw count
        (assoc opts :laps laps, :warmup warmup)))
    (println "\nBenchmarks done:")
    (printed-results @results_)))
 ;;;; Compression
 (defn- bench1-compressor
  [compressor
   {:keys [laps warmup bench-data]
    :or
    {laps       1e4
     warmup     2e4
     bench-data default-bench-data}}]
  (let [data-frozen     (nippy/freeze bench-data {:compressor nil})
        data-compressed                                       (compr/compress   compressor data-frozen)
        time-compress   (enc/bench laps {:warmup-laps warmup} (compr/compress   compressor data-frozen))
        time-decompress (enc/bench laps {:warmup-laps warmup} (compr/decompress compressor data-compressed))]
    {:round   (+ time-compress time-decompress)
     :compress   time-compress
     :decompress time-decompress
     :ratio      (enc/round2 (/ (count data-compressed) (count data-frozen)))}))
 (defn bench-compressors [opts lzma-opts]
  (printed-results
    (merge
      (let [bench1 #(bench1-compressor % opts)]
        {:zstd/prepended     (bench1 (compr/->ZstdCompressor true))
         :zstd/unprepended   (bench1 (compr/->ZstdCompressor false))
         :lz4                (bench1 (compr/->LZ4Compressor))
         :lzo                (bench1 (compr/->LZOCompressor))
         :snappy/prepended   (bench1 (compr/->SnappyCompressor true))
         :snappy/unprepended (bench1 (compr/->SnappyCompressor false))})
      (let [bench1 #(bench1-compressor % (merge opts lzma-opts))]
        {:lzma2/level0 (bench1 (compr/->LZMA2Compressor 0))
         :lzma2/level3 (bench1 (compr/->LZMA2Compressor 3))
         :lzma2/level6 (bench1 (compr/->LZMA2Compressor 6))
         :lzma2/level9 (bench1 (compr/->LZMA2Compressor 9))}))))
 ;;;; Results
 (comment
  {:last-updated    "2024-01-16"
   :system          "2020 Macbook Pro M1, 16 GB memory"
   :clojure-version "1.11.1"
   :java-version    "OpenJDK 21"
   :deps
   '[[com.taoensso/nippy        "3.4.0-beta1"]
     [org.clojure/tools.reader  "1.3.7"]
     [org.clojure/data.fressian "1.0.0"]
     [org.tukaani/xz            "1.9"]
     [io.airlift/aircompressor  "0.25"]]}
  (bench-serialization {:all? true})
  {:reader          {:round 13496, :freeze 5088, :thaw 8408, :size 15880}
   :fressian        {:round 3898,  :freeze 2350, :thaw 1548, :size 12222}
   :nippy/lzma2     {:round 12341, :freeze 7809, :thaw 4532, :size 3916}
   :nippy/encrypted {:round 2939,  :freeze 1505, :thaw 1434, :size 8547}
   :nippy/default   {:round 2704,  :freeze 1330, :thaw 1374, :size 8519}
   :nippy/fast      {:round 2425,  :freeze 1117, :thaw 1308, :size 17088}}
  (enc/round2 (/ 2704 13496)) ; 0.20 of reader   roundtrip time
  (enc/round2 (/ 2704  3898)) ; 0.69 of fressian roundtrip time
  (enc/round2 (/ 8519 15880)) ; 0.54 of reader   output size
  (enc/round2 (/ 8519 12222)) ; 0.70 of fressian output size
  (bench-compressors
    {:laps 1e4 :warmup 2e4}
    {:laps 1e2 :warmup 2e2})
  ;; Note that ratio depends on compressibility of stress data
  {:lz4                {:round 293,  :compress 234,  :decompress 59,  :ratio 0.5}
   :lzo                {:round 483,  :compress 349,  :decompress 134, :ratio 0.46}
   :snappy/prepended   {:round 472,  :compress 296,  :decompress 176, :ratio 0.43}
   :snappy/unprepended {:round 420,  :compress 260,  :decompress 160, :ratio 0.43}
   :zstd/prepended     {:round 2105, :compress 1419, :decompress 686, :ratio 0.3}
   :zstd/unprepended   {:round 1261, :compress 921,  :decompress 340, :ratio 0.3}
   :lzma2/level0       {:round 158,  :compress 121,  :decompress 37,  :ratio 0.24}
   :lzma2/level3       {:round 536,  :compress 436,  :decompress 100, :ratio 0.22}
   :lzma2/level6       {:round 1136, :compress 1075, :decompress 61,  :ratio 0.21}
   :lzma2/level9       {:round 2391, :compress 2096, :decompress 295, :ratio 0.21}})
--- a/test/taoensso/nippy_tests.clj
+++ b/test/taoensso/nippy_tests.clj
@ -4,9 +4,14 @@
   [clojure.test.check            :as tc]
   [clojure.test.check.generators :as tc-gens]
   [clojure.test.check.properties :as tc-props]
-   [taoensso.encore :as enc   :refer []]
+   [taoensso.truss                :as truss :refer [throws?]]
-   [taoensso.nippy  :as nippy :refer [freeze thaw]]
+   [taoensso.encore               :as enc   :refer [ba=]]
-   [taoensso.nippy.benchmarks :as benchmarks]))
+   [taoensso.nippy                :as nippy :refer [freeze thaw]]
   [taoensso.nippy.impl           :as impl]
   [taoensso.nippy.tools          :as tools]
   [taoensso.nippy.compression    :as compr]
   [taoensso.nippy.crypto         :as crypto]
   [taoensso.nippy-benchmarks     :as benchmarks]))
 (comment
  (remove-ns      'taoensso.nippy-tests)
@ -14,23 +19,32 @@
 ;;;; Config, etc.
-(def test-data nippy/stress-data-comparable)
+(def test-data (nippy/stress-data {:comparable? true}))
-(def tc-num-tests 120)
+(def tc-gen-recursive-any-equatable
-(def tc-gens
+  (tc-gens/recursive-gen tc-gens/container-type
-  "Like `tc-gens/any` but removes NaN (which breaks equality tests)"
+    tc-gens/any-equatable))
  (tc-gens/recursive-gen tc-gens/container-type #_simple-type
    (tc-gens/one-of
      [tc-gens/int tc-gens/large-integer #_tc-gens/double
       (tc-gens/double* {:NaN? false})
       tc-gens/char tc-gens/string tc-gens/ratio tc-gens/boolean tc-gens/keyword
       tc-gens/keyword-ns tc-gens/symbol tc-gens/symbol-ns tc-gens/uuid])))
-(comment (tc-gens/sample tc-gens 10))
+(defmacro gen-test [num-tests [data-sym] & body]
  `(let [tc-result#
         (tc/quick-check ~num-tests
           (tc-props/for-all [~data-sym tc-gen-recursive-any-equatable]
             ~@body))]
     (true? (:pass? tc-result#))))
 (comment
  (tc-gens/sample tc-gen-recursive-any-equatable 10)
  (gen-test 10 [gen-data] true))
 ;;;; Core
 (deftest _core
-  [(println (str "Clojure version: " *clojure-version*))
+  (println (str "Clojure version: " *clojure-version*))
  [(is (= test-data test-data) "Test data is comparable")
   (is (=
         (nippy/stress-data {:comparable? true})
         (nippy/stress-data {:comparable? true}))
     "Stress data is deterministic")
   (is (= test-data ((comp thaw freeze) test-data)))
   (is (= test-data ((comp #(thaw   % {:no-header? true
                                       :compressor nippy/lz4-compressor
@ -42,9 +56,6 @@
                           #(freeze % {:password [:salted "p"]}))
                     test-data)))
   (is (= (vec (:objects nippy/stress-data))
         ((comp vec thaw freeze) (:objects nippy/stress-data))))
   (is (= test-data ((comp #(thaw   % {:compressor nippy/lzma2-compressor})
                           #(freeze % {:compressor nippy/lzma2-compressor}))
                     test-data)))
@ -56,45 +67,50 @@
                     test-data)))
   (is (= test-data ((comp #(thaw   % {:compressor nippy/lz4-compressor})
-                           #(freeze % {:compressor nippy/lz4hc-compressor}))
+                           #(freeze % {:compressor nippy/lz4-compressor}))
                     test-data)))
-   (is ; Try roundtrip anything that simple-check can dream up
+   (is (= test-data ((comp #(thaw   % {:compressor nippy/zstd-compressor})
-     (:result (tc/quick-check tc-num-tests
+                           #(freeze % {:compressor nippy/zstd-compressor}))
-                (tc-props/for-all [val tc-gens]
+                     test-data)))
                  (= val (thaw (freeze val)))))))
-   (is (enc/throws? Exception (thaw (freeze test-data {:password "malformed"}))))
+   (is (throws? Exception (thaw (freeze test-data {:password "malformed"}))))
-   (is (enc/throws? Exception (thaw (freeze test-data {:password [:salted "p"]})
+   (is (throws? Exception (thaw (freeze test-data {:password [:salted "p"]}))))
-                                {;; Necessary to prevent against JVM segfault due to
+   (is (throws? Exception (thaw (freeze test-data {:password [:salted "p"]}))))
                                 ;; https://goo.gl/t0OUIo:
                                 :v1-compatibility? false})))
   (is (enc/throws? Exception (thaw (freeze test-data {:password [:salted "p"]})
                                {:v1-compatibility? false ; Ref. https://goo.gl/t0OUIo
                                 :compressor nil})))
-   (is ; Snappy lib compatibility (for legacy versions of Nippy)
+   (is
     (let [^bytes raw-ba    (freeze test-data {:compressor nil})
           ^bytes xerial-ba (org.xerial.snappy.Snappy/compress raw-ba)
           ^bytes iq80-ba   (org.iq80.snappy.Snappy/compress   raw-ba)]
       (= (thaw raw-ba)
          (thaw (org.xerial.snappy.Snappy/uncompress xerial-ba))
          (thaw (org.xerial.snappy.Snappy/uncompress iq80-ba))
          (thaw (org.iq80.snappy.Snappy/uncompress   iq80-ba    0 (alength iq80-ba)))
          (thaw (org.iq80.snappy.Snappy/uncompress   xerial-ba  0 (alength xerial-ba))))))
   (is ; CBC auto-encryptor compatibility
     (= "payload"
       (thaw (freeze "payload" {:password [:salted "pwd"] :encryptor nippy/aes128-cbc-encryptor})
-         (do                   {:password [:salted "pwd"]}))))
+         (do                   {:password [:salted "pwd"]})))
     "CBC auto-encryptor compatibility")
-   (testing "Signed long types"
+   (testing "Unsigned long types"
     (let [range-ushort+ (+ (long @#'nippy/range-ushort) 128)
           range-uint+   (+ (long @#'nippy/range-uint)   128)]
-       [(let [r (range (- range-ushort+) range-ushort+)] (= (thaw (freeze r)) r))
+       [(let [r (range (long -2.5e6) (long 2.5e6))]      (= (thaw (freeze r)) r))
        (let [r (range (- range-ushort+) range-ushort+)] (= (thaw (freeze r)) r))
        (let [n    range-uint+]                          (= (thaw (freeze n)) n))
-        (let [n (- range-uint+)]                         (= (thaw (freeze n)) n))]))])
+        (let [n (- range-uint+)]                         (= (thaw (freeze n)) n))]))
   (is (throws? :ex-info "Failed to freeze type" (nippy/freeze (fn []))))
   (testing "Clojure v1.10+ metadata protocol extensions"
     [(is (throws? :ex-info "Failed to freeze type" (nippy/freeze (with-meta [] {:a :A, 'b   (fn [])}))))
      (is (= {:a :A}              (meta (nippy/thaw (nippy/freeze (with-meta [] {:a :A, 'b/c (fn [])}))))))
      (is (= nil                  (meta (nippy/thaw (nippy/freeze (with-meta [] {       'b/c (fn [])})))))
        "Don't attach empty metadata")])
   (let [d (nippy/stress-data {})]
     [(is (= (vec (:bytes   d)) ((comp vec thaw freeze) (:bytes   d))))
      (is (= (vec (:objects d)) ((comp vec thaw freeze) (:objects d))))])
   (testing "Arrays"
     (binding [nippy/*thaw-serializable-allowlist* nippy/default-freeze-serializable-allowlist]
       (mapv (fn [[k aval]] (is (= (vec aval) (-> aval nippy/freeze nippy/thaw vec)) (name k)))
         (get-in (nippy/stress-data {}) [:non-comparable :arrays]))))
   (is (gen-test 1600 [gen-data] (= gen-data (thaw (freeze gen-data)))) "Generative")])
 ;;;; Custom types & records
@ -104,7 +120,7 @@
 (deftest _types
  [(testing "Extend to custom type"
     [(is
-        (enc/throws? Exception ; No thaw extension yet
+        (throws? Exception ; No thaw extension yet
          (do
            (alter-var-root #'nippy/*custom-readers* (constantly {}))
            (nippy/extend-freeze MyType 1 [x s]
@ -148,20 +164,17 @@
 ;;;; Caching
 (deftest _caching
-  (let [stress [nippy/stress-data-comparable
+  (let [test-data* [test-data test-data test-data test-data] ; Data with duplicates
-                nippy/stress-data-comparable
+        cached (mapv nippy/cache test-data*)
-                nippy/stress-data-comparable
+        cached (mapv nippy/cache test-data*) ; <=1 wrap auto-enforced
                nippy/stress-data-comparable]
        cached (mapv nippy/cache stress)
        cached (mapv nippy/cache stress) ; <=1 wrap auto-enforced
        ]
-    (is (= stress (thaw (freeze stress {:compressor nil}))))
+    [(is (= test-data*  (thaw (freeze test-data* {:compressor nil}))))
-    (is (= stress (thaw (freeze cached {:compressor nil}))))
+     (is (= test-data*  (thaw (freeze cached     {:compressor nil}))))
-    (let [size-stress (count (freeze stress {:compressor nil}))
+     (let [size-stress (count (freeze test-data* {:compressor nil}))
-          size-cached (count (freeze cached {:compressor nil}))]
+           size-cached (count (freeze cached     {:compressor nil}))]
-      (is (>= size-stress (* 3 size-cached)))
+       (is (>= size-stress (* 3 size-cached)))
-      (is (<  size-stress (* 4 size-cached))))))
+       (is (<  size-stress (* 4 size-cached))))]))
 (deftest _caching-metadata
  (let [v1 (with-meta [] {:id :v1})
@ -174,79 +187,107 @@
                 (nippy/cache v1)
                 (nippy/cache v2)])]
-    (is (> (count frozen-without-caching)
+    [(is (> (count frozen-without-caching)
-           (count frozen-with-caching)))
+            (count frozen-with-caching)))
-    (is (= (thaw frozen-without-caching)
+     (is (= (thaw frozen-without-caching)
-           (thaw frozen-with-caching)))
+            (thaw frozen-with-caching)))
-    (is (= (mapv meta (thaw frozen-with-caching))
+     (is (= (mapv meta (thaw frozen-with-caching))
-           [{:id :v1} {:id :v2} {:id :v1} {:id :v2}]))))
+            [{:id :v1} {:id :v2} {:id :v1} {:id :v2}]))]))
-;;;; Stable binary representation of vals
+;;;; Serialized output
-(deftest _stable-bin
+(defn ba-hash [^bytes ba] (hash (seq ba)))
  [(is (= (seq (freeze test-data))
          (seq (freeze test-data)))) ; f(x)=f(y) | x=y
-   ;; As above, but try multiple times to catch possible protocol interface races:
+(defn gen-hashes [] (enc/map-vals (fn [v] (ba-hash (freeze v))) test-data))
-   (is (every? true?
+(defn cmp-hashes [new old] (vec (sort (reduce-kv (fn [s k v] (if (= (get old k) v) s (conj s k))) #{} new))))
         (repeatedly 1000 (fn [] (= (seq (freeze test-data))
                                    (seq (freeze test-data)))))))
-   ;; NB abandoning - no way to do this reliably w/o appropriate contracts from
+(def ref-hashes-v341
-   ;; (seq <unordered-coll>):
+  {:deftype -148586793, :lazy-seq-empty 1277437598, :true -1809580601, :long 598276629, :double -454270428, :lazy-seq -1039619789, :short 1152993378, :meta -858252893, :str-long -1970041891, :instant -1401948864, :many-keywords 665654816, :bigint 2033662230, :sym-ns 769802402, :queue 447747779, :float 603100813, :sorted-set 2005004017, :many-strings 1738215727, :nested -1350538572, :queue-empty 1760934486, :duration -775528642, :false 1506926383, :vector 813550992, :util-date 1326218051, :kw 389651898, :sym -1742024487, :str-short -921330463, :subvec 709331681, :kw-long 852232872, :integer 624865727, :sym-long -1535730190, :list -1207486853, :ratio 1186850097, :byte -1041979678, :bigdec -1846988137, :nil 2005042235, :defrecord -553848560, :sorted-map -1160380145, :sql-date 80018667, :map-entry 1219306839, :false-boxed 1506926383, :uri 870148616, :period -2043530540, :many-longs -1109794519, :uuid -338331115, :set 1649942133, :kw-ns 1050084331, :map 1989337680, :many-doubles -827569787, :char 858269588})
   ;;
   ;; (is (=  (seq (-> test-data freeze))
   ;;         (seq (-> test-data freeze thaw freeze)))) ; f(x)=f(f-1(f(x)))
   ;;
   ;; As above, but with repeated refreeze to catch possible protocol interface races:
   ;; (is (= (seq (freeze test-data))
   ;;        (seq (reduce (fn [frozen _] (freeze (thaw frozen)))
   ;;               (freeze test-data) (range 1000)))))
   ])
-(defn qc-prop-bijection [& [n]]
+(def ref-hashes-v340
-  (let [bin->val (atom {})
+  {:deftype 1529147805, :lazy-seq-empty 1277437598, :true -1809580601, :long 219451189, :double -454270428, :lazy-seq -1039619789, :short 1152993378, :meta 352218350, :str-long -1970041891, :instant -1401948864, :many-keywords 665654816, :bigint 2033662230, :sym-ns 769802402, :queue 447747779, :float 603100813, :sorted-set 1443292905, :many-strings 1777678883, :nested -1590473924, :queue-empty 1760934486, :duration -775528642, :false 1506926383, :vector 89425525, :util-date 1326218051, :kw 389651898, :sym -1742024487, :str-short -1097575232, :subvec -2047667173, :kw-long 852232872, :integer 624865727, :sym-long -1535730190, :list -1113199651, :ratio 1186850097, :byte -1041979678, :bigdec -1846988137, :nil 2005042235, :defrecord 287634761, :sorted-map 1464032648, :sql-date 80018667, :map-entry -1353323498, :false-boxed 1506926383, :uri -1374752165, :period -2043530540, :many-longs 759118414, :uuid -338331115, :set -1515144175, :kw-ns 1050084331, :map 358912619, :many-doubles -827569787, :char 858269588})
        val->bin (atom {})]
    (merge
      (tc/quick-check (or n 1)
        (tc-props/for-all [val tc-gens]
          (let [;; Nb need `seq` for Clojure hash equality:
                bin (hash (seq (freeze val)))]
            (and
              (if (contains? val->bin val)
                (= (get val->bin val) bin) ; x=y => f(x)=f(y) by clj=
                (do (swap! val->bin assoc val bin)
                    true))
              (if (contains? bin->val bin)
                (= (get bin->val bin) val) ; f(x)=f(y) => x=y by clj=
                (do (swap! bin->val assoc bin val)
                    true))))))
      #_{:bin->val @bin->val
         :val->bin @val->bin}
      nil)))
 (comment
-  (tc-gens/sample tc-gens 10)
+  (cmp-hashes ref-hashes-v341 ref-hashes-v340)
-  (:result (qc-prop-bijection 80))
+  [:defrecord :deftype :list :long :many-longs :many-strings :map :map-entry :meta :nested :set :sorted-map :sorted-set :str-short :subvec :uri :vector])
  (let [{:keys [result bin->val val->bin]} (qc-prop-bijection 10)]
    [result (vals bin->val)]))
-(deftest _gc-prop-bijection
+(deftest _stable-serialized-output
-  (is (:result (qc-prop-bijection tc-num-tests))))
+  (testing "Stable serialized output"
    (testing "x=y => f(x)=f(y) for SOME inputs, SOMETIMES"
      ;; `x=y => f(x)=f(y)` is unfortunately NOT true in general, and NOT something we
      ;; promise. Still, we do unofficially try our best to maintain this property when
      ;; possible - and to warn when it'll be violated for common/elementary types.
      [(is (not (ba= (freeze {:a 1 :b 1}) (freeze {:b 1 :a 1}))) "Small (array) map (not= (seq {:a 1 :b 1}) (seq {:b 1 :a 1}))")
       (is (not (ba= (freeze [[]])        (freeze ['()])))       "(= [] '()) is true")
       (is      (ba= (freeze (sorted-map :a 1 :b 1))
                     (freeze (sorted-map :b 1 :a 1))) "Sorted structures are generally safe")
       ;; Track serialized output of stress data so that we can detect unintentional changes,
       ;; and warn about intended ones. Hashes will need to be recalculated on changes to stress data.
       (let [reference-hashes ref-hashes-v341
             failures ; #{{:keys [k v]}}
             (reduce-kv
               (fn [failures k v]
                 (or
                   (when (not= v :taoensso.nippy/skip)
                     (let [frozen (freeze v)
                           actual (ba-hash frozen)
                           ref    (get reference-hashes k)]
                       (when (not= actual ref)
                         (conj failures
                           {:k k,
                            :v {:type (type v), :value v}
                            :actual actual
                            :ref    ref
                            :frozen (vec frozen)}))))
                   failures))
               #{}
               test-data)]
         (is (empty? failures)))])
    (testing "x==y => f(x)=f(y)"
      ;; This weaker version of `x=y => f(x)=f(y)` does hold
      [(is (ba= (freeze test-data)
                (freeze test-data)))
       (is (every? true? (repeatedly 1000 (fn [] (ba= (freeze test-data)
                                                      (freeze test-data)))))
         "Try repeatedly to catch possible protocol interface races")
       (is (gen-test 400 [gen-data]
              (ba= (freeze gen-data)
                   (freeze gen-data))) "Generative")])
    (testing "f(x)=f(f-1(f(x)))"
      [(is (ba= (-> test-data freeze)
                (-> test-data freeze thaw freeze)))
       (is (ba= (freeze test-data)
                (reduce (fn [frozen _] (freeze (thaw frozen))) (freeze test-data) (range 1000)))
         "Try repeatedly to catch possible protocol interface races")
       (is (gen-test 400 [gen-data]
             (ba= (-> gen-data freeze)
                  (-> gen-data freeze thaw freeze))) "Generative")])
    (testing "f(x)=f(y) => x=y"
      (let [vals_ (atom {})]
        (gen-test 400 [gen-data]
          (let [out (freeze     gen-data)
                ref (get @vals_ gen-data ::nx)]
            (swap! vals_ assoc out gen-data)
            (or (= ref ::nx) (= ref out))))))))
 ;;;; Thread safety
 (deftest _thread-safe
  [(is
-     (let [futures
+     (let [futures (mapv (fn [_] (future (= (thaw (freeze test-data)) test-data)))
-           (mapv
+                     (range 50))]
             (fn [_]
               (future
                 (= (thaw (freeze test-data)) test-data)))
             (range 50))]
       (every? deref futures)))
   (is
@ -290,7 +331,7 @@
  [(is (= nippy/*thaw-serializable-allowlist* #{"base.1" "base.2" "add.1" "add.2"})
     "JVM properties override initial allowlist values")
-   (is (enc/throws? Exception (nippy/freeze sem {:serializable-allowlist #{}}))
+   (is (throws? Exception (nippy/freeze sem {:serializable-allowlist #{}}))
     "Can't freeze Serializable objects unless approved by allowlist")
   (is (sem?
@ -372,6 +413,20 @@
     "Don't try to preserve metadata on vars")])
 ;;;; Freezable?
 (deftest _freezable?
  [(is (= (nippy/freezable? :foo)                      :native))
   (is (= (nippy/freezable? [:a :b])                   :native))
   (is (= (nippy/freezable? [:a (fn [])])                  nil))
   (is (= (nippy/freezable? [:a (byte-array [1 2 3])]) :native))
   (is (= (nippy/freezable? [:a (java.util.Date.)])    :native))
   (is (= (nippy/freezable? (Exception.))                  nil))
   (is (= (nippy/freezable? (MyType. "a" "b"))         :native))
   (is (= (nippy/freezable? (MyRec.  "a" "b"))         :native))
   (is (= (nippy/freezable? (Exception.) {:allow-java-serializable? true})
         :maybe-java-serializable))])
 ;;;; thaw-xform
 (deftest _thaw-xform
@ -388,9 +443,29 @@
   (is (= (binding [nippy/*thaw-xform* (map (fn [x] (/ 1 0)))] (thaw (freeze []))) []) "rf not run on empty colls")
-   (let [ex (enc/throws :default (binding [nippy/*thaw-xform* (map (fn [x] (/ 1 0)))] (thaw (freeze [:a :b]))))]
+   (let [ex (truss/throws :default (binding [nippy/*thaw-xform* (map (fn [x] (/ 1 0)))] (thaw (freeze [:a :b]))))]
-     (is (= (-> ex enc/ex-cause enc/ex-cause ex-data :call) '(rf acc in)) "Error thrown via `*thaw-xform*`"))])
+     (is (= (-> ex ex-cause ex-cause ex-data :call) '(rf acc in)) "Error thrown via `*thaw-xform*`"))])
 ;;;; Compressors
 (deftest _compressors
  (println "\nTesting decompression of random data...")
  (doseq [c [compr/zstd-compressor
             compr/lz4-compressor
             compr/lzo-compressor
             compr/snappy-compressor
             compr/lzma2-compressor]]
    (print (str "  With " (name (compr/header-id c)))) (flush)
    (dotimes [_ 5] ; Slow, a few k laps should be sufficient for CI
      (print ".") (flush)
      (dotimes [_ 1000]
        (is
          (nil? (truss/catching :all (compr/decompress c (crypto/rand-bytes 1024))))
          "Decompression never crashes JVM, even against invalid data")))
    (println)))
 ;;;; Benchmarks
-(deftest _benchmarks (is (benchmarks/bench {})))
+(deftest _benchmarks
  (is (benchmarks/bench-serialization {:all? true})))
--- a/wiki/.gitignore
+++ b/wiki/.gitignore
@ -0,0 +1 @@
 README.md
--- a/Getting-started.md
+++ b/Getting-started.md
@ -0,0 +1,145 @@
 # Setup
 Add the [relevant dependency](../#latest-releases) to your project:
 ```clojure
 Leiningen: [com.taoensso/nippy               "x-y-z"] ; or
 deps.edn:   com.taoensso/nippy {:mvn/version "x-y-z"}
 ```
 And setup your namespace imports:
 ```clojure
 (ns my-app (:require [taoensso.nippy :as nippy]))
 ```
 # De/serializing
 As an example of what it can do, let's take a look at Nippy's own reference [stress data](https://taoensso.github.io/nippy/taoensso.nippy.html#var-stress-data):
 ```clojure
 {:nil                   nil
 :true                  true
 :false                 false
 :false-boxed (Boolean. false)
 :char      \ಬ
 :str-short "ಬಾ ಇಲ್ಲಿ ಸಂಭವಿಸ"
 :str-long  (reduce str (range 1024))
 :kw        :keyword
 :kw-ns     ::keyword
 :sym       'foo
 :sym-ns    'foo/bar
 :kw-long   (keyword (reduce str "_" (range 128)) (reduce str "_" (range 128)))
 :sym-long  (symbol  (reduce str "_" (range 128)) (reduce str "_" (range 128)))
 :byte      (byte   16)
 :short     (short  42)
 :integer   (int    3)
 :long      (long   3)
 :float     (float  3.1415926535897932384626433832795)
 :double    (double 3.1415926535897932384626433832795)
 :bigdec    (bigdec 3.1415926535897932384626433832795)
 :bigint    (bigint  31415926535897932384626433832795)
 :ratio     22/7
 :list      (list 1 2 3 4 5 (list 6 7 8 (list 9 10 (list) ())))
 :vector    [1 2 3 4 5 [6 7 8 [9 10 [[]]]]]
 :subvec    (subvec [1 2 3 4 5 6 7 8] 2 8)
 :map       {:a 1 :b 2 :c 3 :d {:e 4 :f {:g 5 :h 6 :i 7 :j {{} {}}}}}
 :map-entry (clojure.lang.MapEntry/create "key" "val")
 :set       #{1 2 3 4 5 #{6 7 8 #{9 10 #{#{}}}}}
 :meta      (with-meta {:a :A} {:metakey :metaval})
 :nested    [#{{1 [:a :b] 2 [:c :d] 3 [:e :f]} [#{{[] ()}}] #{:a :b}}
             #{{1 [:a :b] 2 [:c :d] 3 [:e :f]} [#{{[] ()}}] #{:a :b}}
             [1 [1 2 [1 2 3 [1 2 3 4 [1 2 3 4 5 "ಬಾ ಇಲ್ಲಿ ಸಂಭವಿಸ"] {} #{} [] ()]]]]]
 :regex          #"^(https?:)?//(www\?|\?)?"
 :sorted-set     (sorted-set 1 2 3 4 5)
 :sorted-map     (sorted-map :b 2 :a 1 :d 4 :c 3)
 :lazy-seq-empty (map identity ())
 :lazy-seq       (repeatedly 64 #(do nil))
 :queue-empty    (into clojure.lang.PersistentQueue/EMPTY [:a :b :c :d :e :f :g])
 :queue                clojure.lang.PersistentQueue/EMPTY
 :uuid       (java.util.UUID. 7232453380187312026 -7067939076204274491)
 :uri        (java.net.URI. "https://clojure.org")
 :defrecord  (nippy/StressRecord. "data")
 :deftype    (nippy/StressType.   "data")
 :bytes      (byte-array   [(byte 1) (byte 2) (byte 3)])
 :objects    (object-array [1 "two" {:data "data"}])
 :util-date (java.util.Date. 1577884455500)
 :sql-date  (java.sql.Date.  1577884455500)
 :instant   (java.time.Instant/parse "2020-01-01T13:14:15.50Z")
 :duration  (java.time.Duration/ofSeconds 100 100)
 :period    (java.time.Period/of 1 1 1)
 :throwable (Throwable. "Msg")
 :exception (Exception. "Msg")
 :ex-info   (ex-info    "Msg" {:data "data"})
 :many-longs    (vec (repeatedly 512         #(rand-nth (range 10))))
 :many-doubles  (vec (repeatedly 512 #(double (rand-nth (range 10)))))
 :many-strings  (vec (repeatedly 512         #(rand-nth ["foo" "bar" "baz" "qux"])))
 :many-keywords (vec (repeatedly 512
                       #(keyword
                          (rand-nth ["foo" "bar" "baz" "qux" nil])
                          (rand-nth ["foo" "bar" "baz" "qux"    ]))))}
 ```
 Serialize it:
 ```clojure
 (def frozen-stress-data (nippy/freeze (nippy/stress-data {})))
 => #<byte[] [B@3253bcf3>
 ```
 Deserialize it:
 ```clojure
 (nippy/thaw frozen-stress-data)
 => {:bytes        (byte-array [(byte 1) (byte 2) (byte 3)])
    :nil          nil
    :boolean      true
    <...> }
 ```
 Couldn't be simpler!
 # Streaming
 - To serialize directly to a `java.io.DataInput`, see [`freeze-to-out!`](https://taoensso.github.io/nippy/taoensso.nippy.html#var-freeze-to-out.21).
 - To deserialize directly from a `java.io.DataOutput`, see [`thaw-from-in!`](https://taoensso.github.io/nippy/taoensso.nippy.html#var-thaw-from-in.21).
 # Encryption
 > You may want to consider using Nippy with [Tempel](https://www.taoensso.com/tempel) for more comprehensive encryption options.
 Nippy also gives you **dead simple data encryption**.  
 Add a single option to your usual freeze/thaw calls like so:
 ```clojure
 (nippy/freeze (nippy/stress-data {}) {:password [:salted "my-password"]}) ; Encrypt
 (nippy/thaw   <encrypted-data>       {:password [:salted "my-password"]}) ; Decrypt
 ```
 There's two default forms of encryption on offer: `:salted` and `:cached`. Each of these makes carefully-chosen trade-offs and is suited to one of two common use cases. See [`aes128-encryptor`](https://taoensso.github.io/nippy/taoensso.nippy.html#var-aes128-encryptor) for a detailed explanation of why/when you'd want one or the other.
 # Custom types
 It's easy to extend Nippy to your own data types:
 ```clojure
 (defrecord MyType [data])
 (nippy/extend-freeze MyType :my-type/foo ; A unique (namespaced) type identifier
  [x data-output]
  (.writeUTF data-output (:data x)))
 (nippy/extend-thaw :my-type/foo ; Same type id
  [data-input]
  (MyType. (.readUTF data-input)))
 (nippy/thaw (nippy/freeze (MyType. "Joe"))) => #taoensso.nippy.MyType{:data "Joe"}
 ```
--- a/Operational-considerations.md
+++ b/Operational-considerations.md
@ -0,0 +1,30 @@
 # Data longevity
 Nippy is widely used to store **long-lived** data and promises (as always) that **data serialized today should be readable by all future versions of Nippy**.
 But please note that the **converse is not generally true**:
 - Nippy `vX` **should** be able to read all data from Nippy `vY<=X` (backwards compatibility)
 - Nippy `vX` **may/not** be able to read all data from Nippy `vY>X` (forwards compatibility)
 # Rolling updates and rollback
 From time to time, Nippy may introduce:
 - Support for serializing **new types**
 - Optimizations to the serialization of **pre-existing types**
 To help ease **rolling updates** and to better support **rollback**, Nippy (since version v3.4.1) will always introduce such changes over **two version releases**:
 - Release 1: to add **read support** for the new types
 - Release 2: to add **write support** for the new types
 Starting from v3.4.1, Nippy's release notes will **always clearly indicate** if a particular update sequence is recommended.
 # Stability of byte output
 It has **never been an objective** of Nippy to offer **predictable byte output**, and I'd generally **recommend against** depending on specific byte output.
 However, I know that a small minority of users *do* have specialized needs in this area.
 So starting with Nippy v3.4, Nippy's release notes will **always clearly indicate** if any changes to byte output are expected.
--- a/Evolving-your-Nippy-data.md
+++ b/Evolving-your-Nippy-data.md
@ -0,0 +1,278 @@
 > This article is **community content** kindly contributed by a Nippy user (@Outrovurt)
 This article describes a number of use cases where you need to make changes to your code which will have some impact on data you have already frozen using Nippy, and how best to manage each specific case. We will also discuss custom freezing and thawing.
 It is assumed you have working knowledge of a good editor (e.g. emacs) and know how to start a Clojure REPL (e.g. via CIDER).
 Throughout this article we will refer to serialization as *freezing*, and deserialization as *thawing*, which are the terms used by Nippy. (The word "thawer" will be used throughout the article, it's obviously made up, but please bear with it!)
 # Project setup
 If you want to follow along, you can create a fresh project using whichever Clojure project management tool you are currently most comfortable with (lein, Clojure deps), and [include Nippy in the dependencies](https://github.com/taoensso/nippy/wiki#setup). Create the following namespaces:
 * nippy.evolve
 * nippy.other
 and delete any default code which is generated for you by your project management tool.
 We will start in `nippy.evolve`. Ensure your `(ns ...)` looks like this:
 ```clojure
 (ns nippy.evolve
  (:require
   [taoensso.nippy
    :refer (freeze
            thaw)]))
 ```
 Start a REPL and switch to `nippy.evolve` if you aren't already there.
 # Freezing a record
 Create the following record, either in your source code or in the REPL, and create a new instance of it:
 ```clojure
 (defrecord FirstRec [])
 (def x1 (FirstRec.))
 ```
 Now freeze it:
 ```clojure
 (def f1 (freeze x1))
 ```
 The first thing you'll notice is that you don't have to set anything up at all, Nippy will freeze the record instance out of the box. It does this by determining that `x1` is a record, and uses a built-in freezer to freeze it.
 ## A frozen record
 Let's take a quick look at `f1` at the REPL:
 ```clojure
 nippy.evolve> (type f1)
 [B
 nippy.evolve> f1
 [78, 80, 89, 0, 48, 21, 110, 105, 112, 112, 121, 46, 101, 118, 111,
 108, 118, 101, 46, 70, 105, 114, 115, 116, 82, 101, 99, 19]
 ```
 The "[B" indicates that this is a Java Byte array, which you can also create using the Clojure function `byte-array`.
 The value of `f1` is an array of bytes, consisting of two parts:
 * the envelope
  - a 4-byte header, followed by
  - a 1-byte type id
 * the packet itself, whatever you are encoding
 The header provides sanity checking, the Nippy version number that created it, and information related to any compression or encryption employed. We won't go into detail here as to how the header is composed as it is not relevant to our discussion.
 The type id tells us what type of data we have frozen. A positive value indicates a built-in type. In this case we have 48, which refers to a record, specifically a "small record" (small referring to the total number of bytes used to encode the body of the record.) This is all explained in the Nippy source code, where you can find a list of all built-in types that Nippy recognizes together with the type id used to represent it. In the latest version of Nippy this list can be found in the var `public-types-spec`.
 So when we froze an instance of `FirstRec`, we used a built-in freezer for records to produce the above byte array.
 What about the rest of the array? There are a total of 28 bytes, 5 of which are for the envelope, so the remaining 23 bytes are for the packet itself. But wait a minute. If we are basically freezing an empty record with no fields, why do we need 23 bytes to freeze it? The answer is that while the envelope encodes the fact that the remaining data is for a record, it also needs to encode the type of record that we have frozen. Otherwise there is no way to thaw it back to a record of type `FirstRec`. Since all envelopes contain 5 bytes, this information can only be encoded in one place: the packet itself.
 So if you type the following at the REPL, you'll get a clue as to what is happening:
 ```clojure
 nippy.evolve> (freeze "nippy.evolve.FirstRec")
 [78, 80, 89, 0, 105, 21, 110, 105, 112, 112, 121, 46, 101, 118, 111,
 108, 118, 101, 46, 70, 105, 114, 115, 116, 82, 101, 99]
 ```
 Once again the first 4-bytes represent the header. The fifth byte, 105, tells us that this is a string (specifically a "small" string of under 128 bytes), and the remaining packet is a 22-byte array:
 `[21, 110, 105, 112, 112, 121, 46, 101, 118, 111,
 108, 118, 101, 46, 70, 105, 114, 115, 116, 82, 101, 99]`
 If you look back at `f1` above, you will see that of the 23 bytes of the packet, the first 22 bytes are identical to the 22 bytes of the frozen string above. In other words, Nippy encodes the fully-qualified record name at the very start of the packet itself.
 That just leaves a single byte, 19, at the end of `f1`. You can probably guess what this represents, so let's try the following:
 ```clojure
 nippy.evolve> (freeze {})
 [78, 80, 89, 0, 19]
 ```
 Here we have tried to freeze just an empty map, and that has produced what appears to be a byte array with just an envelope and no packet. Ignoring the header, the fifth byte is 19, which corresponds to an empty map (:map-0 in the code), so there is no need for any packet.
 To summarise, when Nippy freezes an empty record, it encodes it with:
 * a 4-byte header
 * a 1-byte type-id of 48 indicated a small record
 * a 23-byte packet, the first 22 bytes of which represent the string "nippy.evolve.FirstRec", and the final byte which represents an empty map
 This of course contains all the information Nippy requires to thaw the data back to an instance of `FirstRec`.
 ## Thawing a record
 Now let us turn to thawing. Enter the following code into your source file or into the REPL:
 ```clojure
 (def t1 (thaw f1))
 ```
 ```clojure
 nippy.evolve> t1
 {}
 nippy.evolve> (type t1)
 nippy.evolve.FirstRec
 ```
 Exactly as we expected, `t1` returns what appears to be an empty map (though this depends on how your REPL is set up), but when we examine its type, we find that is has correctly been thawed as a `nippy.evolve.FirstRec`. This is entirely due to the way Nippy has interpreted all the information provided in the envelope and packet, described in the previous section.
 # Evolving your code
 So without setting anything up at all in your project, you can see how simple it is just to use Nippy's `freeze` and `thaw` functions to serialize instances of any record you care to create. However, if you have been following the above discussion, you will probably have noted that there are a number of problems here, one or more of which you might even have run into at some stage:
 * a number of bytes are used to encode the name of the record in the packet; in our example 22 bytes are used
 * since the name of the record is encoded in the packet, this means that if we change the name of the record or move it to another namespace, then try to thaw a previously frozen byte array, the operation will since Nippy will be unable to match up the previously encoded with the now renamed or moved record
 We will look at moving and renaming first, and then consider how we can reduce the number of bytes in a packet afterwards.
 ## Moving or renaming a record
 If we want to move or rename a record, for all data previously frozen using the record before renaming/moving it, Nippy will no longer be able to thaw that data since it can no longer match the record name encoded in the packet with a class generated by the record. To be exact, if you try this within the same session, while the REPL is open, then even if you have moved/renamed a record, the old record and the compiled class associated with it will still be available. This is a consequence of the way Clojure compiles records, and even if you try to do an `(ns-unamp 'nippy.evolve 'FirstRec)`, it will still be there. So to better understand this issue, we are going to first save the frozen byte array `f1` to a file, as follows.
 Update the (ns) form to include the following:
 ```clojure
 (ns nippy.evolve
  (:require
   ...
   [clojure.java.io
    :refer (file
            output-stream
            input-stream)]
   ))
 ```
 Now enter the following code into the REPL:
 ```clojure
 nippy.evolve> (with-open [out (output-stream (file "./frozen-first-rec"))]
                (.write out f1))
 nil
 ```
 This will result in the file `./frozen-first-rec` being created in the top-level of your project. We will come back to this file subsequently.
 Next, move `FirstRec` to the namespace `nippy.other`, and delete any code which references it within `nippy.evolve`:
 ```clojure
 (ns nippy.other)
 (defrecord FirstRec [])
 ```
 Now quit the REPL, and start a new one. If not already there, change to namespace `nippy.evolve` and type the following:
 ```clojure
 nippy.evolve> FirstRec
 Syntax error compiling at (*cider-repl clojure/evolve:localhost:36735(clj)*:0:0).
 Unable to resolve symbol: FirstRec in this context
 ```
 You should see the above error, which shows that FirstRec is no longer defined in `nippy.evolve`.
 Still from within `nippy.evolve`, type the following:
 ```clojure
 nippy.evolve> (with-open [ina (input-stream (file "./frozen-first-rec"))]
                (let [buf (byte-array 28)
                      n   (.read in buf)]
                  (thaw buf)))
 ```
 This code attempts to open the file `./frozen-first-rec` and read it into `buf`, a byte array. If you have been following everything exactly thus far, running the above should result in the following being returned:
 ```clojure
 #:nippy{:unthawable
        {:type :record,
         :cause :exception,
         :class-name "nippy.evolve.FirstRec",
         :content {},
         :exception #error {...}}}
 ```
 Once again, this is to be expected. We have tried to thaw a byte array corresponding to a record with a class-name of "nippy.evolve.FirstRec", which of course no longer exists as we have moved it to `nippy.other`.
 Whenever you encounter a `:nippy/unthawable` as a result of thawing, one approach is to write custom code to fix it. For example in the above situation, you could parse the map, and for `:type :record`, `:class-name "nippy.evolve.FirstRec"`, you could then look at the `:content` and create that as a `nippy.other.FirstRec` record. If the `:nippy/unthawable` appears deeply nested within the returned structure, you could call `clojure.walk/prewalk` as a more general solution, and provide a mapping table of {<old-class-name-str> <new-class-name>}, in this case {"nippy.evolve.FirstRec" nippy.other.FirstRec}, and use that to create FirstRec records of the new type. In any cases where you don't have access to the frozen files containing the old format, for example where you have created a desktop application which saves files which contain a frozen data structure, this will be your only option. However, in cases where you do have access to the frozen data, there is an alternative, better approach.
 ## Custom freeze and thaw
 Before we talk about custom freeze and thaw, it's worth taking a step back and looking at how each of these processes work from a high-level.
 * **freezing** takes as its input a piece of data, and the process is driven entirely by the *type* of that data
 * **thawing** takes as its input a piece of previously frozen data, and that process is driven by the *type-id* in the envelope and where appropriate some additional data in the packet, such as the name of the record's class for records
 In general, any data we freeze, we want to be able to thaw back to its original form. In other words, the following should always hold true:
 ```clojure
 (= data
   (-> data freeze thaw))
 ```
 More accurately, at any given time we want to be able to restore any frozen data to its original state when we thaw it. Although this appears to be described by the above condition, there is a subtle but important distinction in that the above assumes that we are freezing and then thawing the data an instant later, whereas in reality *the thawing process can happen at any future time*. What this means is that when writing custom freeze and thaw code, it is important that only the thaw code matches the frozen data at any given time. This will become important soon.
 In situations where we have access to previously frozen data, if we want to rename or move a record, we have an additional option to parsing the result of thaw and looking for the occurrence of any `:nippy/unthawable` maps nested in the resultant data (described above): custom freezing and thawing. Even if we have already frozen data using the built-in record freezer, we can still deal with this situation fairly easily. The trick is to understand that there is a sequence to be followed when it comes to implementing custom freezers and thawers.
 In our above example, to avoid receiving the `:nippy/unthawable` result, we can start by moving the `defrecord` code back from `nippy.other` to `nippy.evolve`. Now if we evaluate the `nippy.evolve` namespace, then attempt to thaw the file we saved, we should get back our original data that we froze before, an instance of a record of type `nippy.evolve.FirstRec`. So far so good. Now the next step is to break the dependency between the frozen data and the name of the original record used to freeze it. To do this, we can write a custom freezer and thawer, and the best part is that we can have these active within nippy at the same time as the built-in record freezer/thawer. Here is how:
 First, within `nippy.evolve`, update the `(ns)` form to include `extend-freeze` and `extend-thaw`:
 ```clojure
 (ns nippy.evolve
  (:require
   [taoensso.nippy
    :refer (...
            extend-freeze
            extend-thaw
            freeze-to-out!
            thaw-from-in!)]
   ...
   ))
 ```
 Ensure that the the following code is included in `nippy.evolve`:
 ```clojure
 (defrecord FirstRec [])
 ```
 Then add the following code:
 ```clojure
 (extend-freeze FirstRec 1
               [x data-out]
               (freeze-to-out!
                data-out
                (into {}
                      (:data x))))
 (extend-thaw 1 [data-input] (map->FirstRec (thaw-from-in! data-input)))
 ```
 These two blocks create respectively a custom freezer for FirstRec, which writes out an envelope with custom id 1, and a custom thawer which is used only for packets with custom id 1. We can use any id in the range `1 <= id < = 127`. As stated at the start of this section, this code shows that the freezer is driven by the type of data being frozen, and the thawer is driven only by the custom id of the data being thawed.
 Now evaluate the whole `nippy.evolve` namespace again. This will extend Nippy by providing it with a custom freeze and thaw for any instances of `FirstRec`:
 * from this point onwards, any new data we create and freeze will be frozen using the custom freezer
 * any newly frozen data will be thawed by the above custom thawer
 * any previously frozen data, with type-id 48 for records (see above), will still be thawed by the built-in record thawer
 This last point is important in that it allows us to simultaneously deal with legacy data while also being able to process new data.
 Let's try freezing a new record:
 ```clojure
 nippy.evolve> (freeze (FirstRec.))
 [78, 80, 89, 0, -1, 19]
 ```
 Once again we have our 4-byte header, but this time we have a negative number as our type-id. This is actually the negative of the custom-id we specified in our call to `extend-freeze`, and is how Nippy stores custom ids. We could have also used a (preferably namespaced) keyword, but that would have taken an extra 16-bits (a hash of the keyword) in the packet itself, and arguably doesn't provide any benefits over using an integer id. As long as we maintain a mapping between custom id and type in our code, and don't use the same custom id for a completely different type in the future, we shouldn't run into any issues with using a custom id over a keyword.
 The packet in this case is just a single byte, 19, which refers to an empty map in nippy.clj type-ids. This map is then used by the thawer to reconstruct our original instance a `FirstRec`.
 The first thing that should be evident is that this is much shorter, by 22-bytes, than the output produced by the built-in record freezer. This is because our custom freezer only stores the record as a map, with no string corresponding to the name of the record. This has resulted in decoupling the frozen data from any concrete record type (e.g. `nippy.evolve.FirstRec`), by instead coupling it to only an arbitrary custom id of our choosing (e.g. 1), and leaving us to provide the mapping between the custom id and some type within the custom thawer, which from now on we can do by updating the thawer with custom id 1.
--- a/wiki/Home.md
+++ b/wiki/Home.md
@ -0,0 +1,8 @@
 See the **menu to the right** for content 👉
 # Contributions welcome
 **PRs very welcome** to help improve this documentation!  
 See the [wiki](../tree/master/wiki) folder in the main repo for the relevant files.
 \- [Peter Taoussanis](https://www.taoensso.com)
--- a/wiki/README.md
+++ b/wiki/README.md
@ -0,0 +1,5 @@
 # Attention!
 This wiki is designed for viewing from [here](../../../wiki)!
 Viewing from GitHub's file browser will result in **broken links**.
Author	SHA1	Message	Date
Peter Taoussanis	ae4463a85c	[nop] Drop use of deprecated `enc/binding`	2025-05-04 15:17:13 +02:00
Peter Taoussanis	1b99516177	[doc] Misc improvements	2025-04-15 10:42:51 +02:00
Peter Taoussanis	e68c2d56fe	v3.5.0 (2025-04-15)	2025-04-15 08:58:10 +02:00
Peter Taoussanis	bfba59483a	[new] Add string array type to default thaw-serializable-allowlist	2025-04-14 23:03:17 +02:00
Peter Taoussanis	f7bb2824ac	[new] Add value tests for non-comparable types	2025-04-14 23:03:17 +02:00
Peter Taoussanis	8d62dc2826	[new] Use Truss exceptions on errors Ref. https://cljdoc.org/d/com.taoensso/truss/CURRENT/api/taoensso.truss#ctx	2025-04-14 23:03:17 +02:00
Peter Taoussanis	da57206b0d	[mod] Drop official Clojure v1.9 support Clojure v1.9 was released December 8, 2017 (~7 years ago) Clojure v1.10 was released December 17, 2018 (~6 years ago) Official support continues for v1.10, v1.11, v1.12.	2025-04-14 23:03:17 +02:00
Peter Taoussanis	e0f49ced5a	[nop] Bump deps	2025-04-14 23:03:17 +02:00
Peter Taoussanis	8d107650cd	[new] [#184 ] Incl. cause on non-native freeze failures Before this commit: - When freezing an item WITHOUT a native Nippy implementation, Nippy may try to use (1) Java Serializable or (2) Clojure's reader. If these also fail, an ex-info will be thrown. The ex-info does NOT include any info about possible exceptions from (1) or (2). After this commit: - The thrown ex-info now includes info about possible exceptions from (1) and (2). These can be useful, e.g. when indicating an OOM error, etc.	2025-04-14 23:03:17 +02:00
Peter Taoussanis	1026ea0ae7	[doc] Clarify `freeze-fallback` docstring	2025-04-14 23:03:17 +02:00
Peter Taoussanis	c92457025f	[nop] Housekeeping	2025-04-14 23:03:17 +02:00
Peter Taoussanis	3cb29f3c2e	v3.5.0-RC1 (2024-10-28)	2024-10-28 11:42:59 +01:00
Peter Taoussanis	a9ea13618c	[nop] Maintain new type id info	2024-10-28 11:42:59 +01:00
Peter Taoussanis	d415a2bf72	[new] [#178 ] Add support for native arrays: strings, longs, ints, doubles, floats	2024-10-28 11:42:59 +01:00
Peter Taoussanis	b217db5579	[new] [#175 ] Mark cache feature as stable	2024-10-28 10:23:31 +01:00
Peter Taoussanis	9022aad018	[doc] Misc doc improvements	2024-10-28 10:14:25 +01:00
Peter Taoussanis	c0d1da1bb4	[nop] Housekeeping	2024-10-28 10:14:25 +01:00
Peter Taoussanis	bb178f66fc	[nop] Bump deps	2024-10-28 10:11:34 +01:00
Peter Taoussanis	9b380821cd	v3.4.2 (2024-05-26)	2024-05-26 14:24:15 +02:00
Peter Taoussanis	c5209e32ce	[nop] Bump deps	2024-05-26 14:24:15 +02:00
Peter Taoussanis	f6240582e1	[#174 ] Improve `extend-freeze` docstring	2024-05-03 11:21:54 +02:00
Peter Taoussanis	4cb2a14adf	v3.4.1 (2024-05-02)	2024-05-02 14:26:25 +02:00
Peter Taoussanis	dc52356106	[new] Improve data compatibility when updating Nippy versions When support is added for a new type in Nippy version X, it necessarily means that data containing that new type and frozen with Nippy version X is unthawable with Nippy versions < X. Earlier versions of Nippy will throw an exception on thawing affected data: \"Unrecognized type id (<n>). Data frozen with newer Nippy version?\" This can present a challenge when updating to new versions of Nippy, e.g.: - Rolling updates could lead to old and new versions of Nippy temporarily co-existing. - Data written with new types could limit your ability to revert a Nippy update. There's no easy solution to this in GENERAL, but we CAN at least help reduce the burden related to CHANGES in core data types by introducing changes over 2 phases: 1. Nippy vX reads new (changed) type, writes old type 2. Nippy vX+1 writes new (changed) type When relevant, we can then warn users in the CHANGELOG to not leapfrog (e.g. Nippy vX -> Nippy vX+2) when doing rolling updates. This commit bootstraps the new compatibility feature by initially targeting core type compatibility with Nippy v3.2.0 (2022-07-18). A future Nippy version (e.g. v3.5.0) will then target v3.4.0, with an appropriate CHANGELOG instruction to update in phases for environments that involve rolling updates.	2024-05-02 14:26:25 +02:00
Peter Taoussanis	bd4d5205d5	[doc] Add data compatibility warning to CHANGELOG	2024-05-02 14:18:29 +02:00
Peter Taoussanis	229ab94c14	[nop] Housekeeping	2024-05-02 13:58:50 +02:00
Peter Taoussanis	535d4e5ab0	v3.4.0 (2024-04-30)	2024-04-30 11:39:09 +02:00
Peter Taoussanis	51298e9252	[nop] Bump deps	2024-04-30 11:14:11 +02:00
Peter Taoussanis	738023764c	[nop] Misc housekeeping	2024-04-30 11:14:11 +02:00
Peter Taoussanis	1b05c9b8f9	v3.4.0-RC3 (2024-04-10)	2024-04-10 12:01:03 +02:00
Peter Taoussanis	82a050b925	[mod] Don't attach empty metadata	2024-04-10 11:29:09 +02:00
Peter Taoussanis	37cf415c02	[new] [#171 ] Auto strip metadata protocol extensions Allows serialization of next.jdbc results, etc.	2024-04-10 11:29:09 +02:00
Peter Taoussanis	92c4a83d61	[fix] Broken `final-freeze-fallback` default val	2024-04-10 11:29:09 +02:00
Peter Taoussanis	af928ed6a4	[nop] Refactor `deftype` freezer	2024-04-10 11:29:09 +02:00
Peter Taoussanis	f749e07eed	[nop] Switch `nippy.tools` to faster `enc/binding`	2024-04-10 11:29:09 +02:00
Peter Taoussanis	4d96757447	[nop] Bump deps	2024-04-10 11:29:09 +02:00
Peter Taoussanis	03c4cf1784	[nop] Update project template	2024-03-19 15:11:10 +01:00
Peter Taoussanis	ea7d9ae9de	v3.4.0-RC2 (2024-02-26)	2024-02-26 11:08:14 +01:00
Peter Taoussanis	cb0b871fe8	[new] Re-enable Snappy compressor Upstream safety issue has been resolved, Ref. <https://github.com/airlift/aircompressor/issues/183>.	2024-02-26 11:07:42 +01:00
Peter Taoussanis	7be9b4f789	[nop] Bump deps	2024-02-26 11:07:42 +01:00
Peter Taoussanis	cb5b7cf063	[fix] [#169 ] Can't auto-identify `:zstd` compressor when decompressing	2024-02-26 11:07:42 +01:00
Peter Taoussanis	40143e71ee	[nop] Misc benchmark housekeeping	2024-02-26 11:07:42 +01:00
Peter Taoussanis	7e84f58ee4	[nop] Update project template	2024-02-25 19:11:46 +01:00
Peter Taoussanis	b4d161db53	v3.4.0-RC1 (2024-02-06)	2024-02-06 16:02:05 +01:00
Peter Taoussanis	578c585bbf	[mod] Remove `nippy/snappy-compressor` Details: - Nippy will continue to support thawing OLD data that was originally compressed with Snappy. - But Nippy will no longer support freezing NEW data with Snappy. Motivation: - The current Snappy implementation can cause JVM crashes in some cases [1]. - The only alternative JVM implementation that seems to be safe [2] uses JNI and so would introduce possible incompatibility issues even for folks not using Snappy. - Nippy already moved to the superior LZ4 as its default compression scheme in v2.7.0, more than 9 years ago. [1] Ref. <https://github.com/airlift/aircompressor/issues/183> [2] Ref. <https://github.com/xerial/snappy-java>	2024-02-06 16:01:13 +01:00
Peter Taoussanis	676898495c	[wip] Explore Snappy implementations	2024-02-06 14:30:59 +01:00
Peter Taoussanis	7d2800d106	[nop] Updates for latest Encore	2024-02-06 14:30:59 +01:00
Peter Taoussanis	3c27f03bc4	[nop] Bump deps	2024-02-06 14:30:59 +01:00
Peter Taoussanis	dcc6b081f1	[new] [#164 ] Update benchmarks	2024-02-06 14:30:59 +01:00
Peter Taoussanis	f287df9e9c	[nop] thaw-xform housekeeping	2024-02-06 14:30:59 +01:00
Peter Taoussanis	9b27a00a59	[nop] Protocol housekeeping	2024-02-06 14:30:59 +01:00
Peter Taoussanis	9db09e16a9	[new] [#163 ] Track serialized output in tests	2024-02-06 14:30:59 +01:00
Peter Taoussanis	c2770c6e99	[mod] Refactor stress data BREAKING for the very small minority of folks that use `nippy/stress-data`. Changes: 1. Make `nippy/stress-data` a function It's unnecessarily wasteful to generate and store all this data when it's not being used in the common case. 2. Make data deterministic The stress data will now generally be stable by default between different versions of Nippy, etc. This will help support an upcoming test for stable serialized output.	2024-02-06 14:30:59 +01:00
Peter Taoussanis	ba6477c097	[nop] Refactor type-checking, remove vestigial utils ns	2024-02-06 14:30:59 +01:00
Peter Taoussanis	9c260b03c4	[doc] Add pointer to correct wiki UI	2024-02-06 14:30:59 +01:00
Peter Taoussanis	27b3ed958b	[nop] Misc housekeeping	2024-02-06 14:30:59 +01:00
Peter Taoussanis	e2a44abf6f	[nop] Update README	2024-02-06 09:28:48 +01:00
Peter Taoussanis	2900a4d758	[nop] [#163 ] Update CHANGELOG	2024-02-06 09:28:48 +01:00
Peter Taoussanis	265b15c94c	[fix] Resolve Babashka build issue	2024-02-06 09:28:48 +01:00
Peter Taoussanis	cba055306a	[fix] Resolve Lein profile warning	2024-02-06 09:28:48 +01:00
Peter Taoussanis	0d002f8d06	v3.4.0-beta1 (2023-09-26)	2023-10-11 14:30:54 +02:00
Peter Taoussanis	d566134da8	[nop] Misc housekeeping	2023-10-11 14:23:34 +02:00
Peter Taoussanis	f3ff7ae8a3	[new] Add native `MapEntry` freezer	2023-10-11 14:23:34 +02:00
Peter Taoussanis	fb6f75e4d7	[new] Smarter, faster, protocol-based `freezable?` util	2023-10-11 14:23:34 +02:00
Peter Taoussanis	e0cd00345d	[nop] Update docs	2023-10-11 14:23:34 +02:00
Peter Taoussanis	99970d5129	[nop] Update benchmark results	2023-10-11 14:23:34 +02:00
Peter Taoussanis	bcf767332e	[nop] Move benchmarks ns under tests dir Prevents benchmark code from being unnecessarily included as dependency	2023-10-11 14:23:34 +02:00
Peter Taoussanis	fef079d81d	[new] Add subvec to stress data	2023-10-11 14:23:34 +02:00
Peter Taoussanis	6ad5aebd1a	[new] Add `:zstd` compressor, new compressor backend Also switch to https://github.com/airlift/aircompressor for faster and combined implementations of: LZ4, Snappy	2023-10-11 14:23:34 +02:00
Peter Taoussanis	c8f30e171d	[wip] `aircompressor` experiments (pure Java compression lib)	2023-10-11 14:23:34 +02:00
Peter Taoussanis	b28b0ca175	[nop] Remove accidental duplicate test ns	2023-10-11 14:23:34 +02:00
Peter Taoussanis	d99e0f8541	v3.3.0 (2023-10-11)	2023-10-11 14:12:08 +02:00
Peter Taoussanis	54d179f629	v3.3.0-RC2 (2023-09-25)	2023-09-25 11:55:29 +02:00
Peter Taoussanis	01e42d23e6	[new] [#160 ] Add more info to `freeze-fallback` docstring	2023-09-25 11:50:06 +02:00
Peter Taoussanis	df5a7df91f	[nop] Update project template	2023-09-25 11:50:06 +02:00
Peter Taoussanis	e864294321	[nop] Changes for dependency bumps	2023-09-25 11:50:06 +02:00
Peter Taoussanis	7953751eba	[nop] Bump deps	2023-09-25 11:50:06 +02:00
Peter Taoussanis	8d76d9c350	[nop] Improve generative tests, etc. Incl.: - Enlarge set of generated data types - Use generative tests in more cases - Run more test rounds	2023-09-25 11:50:06 +02:00
Peter Taoussanis	d5a836326a	[nop] Misc housekeeping	2023-09-25 11:33:32 +02:00
Peter Taoussanis	ed95701c79	[nop] Bring back private `write-str-sm` Hadn't actually intended to remove this	2023-08-03 17:14:16 +02:00
Peter Taoussanis	ac24f872a8	[nop] Add missing metadata to new `thaw-xform` var	2023-08-02 14:44:07 +02:00