diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d249e1..a35b1e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,19 @@
 # Change Log
 All notable changes to this project will be documented in this file. This change log follows the conventions of [keepachangelog.com](http://keepachangelog.com/).
 
+## [0.1.205]
+### Added
+- An `address?` predicate
+
+### Fixed
+- Compound types caused problems in arglists meta on expansion of `defcfn`
+- Compound types were not allowed as return types in `defcfn`
+- `nil` was not considered a null pointer
+- Primitive-serializing types fail to compile as arguments to downcall handles
+- Primitive-serializing types fail to load as arguments to upcall functions
+- Void return types on upcalls crash the JVM
+- Invalid implementation of serialize-into for primitive types
+
 ## [0.1.192] - 2021-09-30
 ### Added
 - An `::ffi/address` key to wrapper functions' metadata
@@ -28,6 +41,7 @@ All notable changes to this project will be documented in this file. This change
 - Support for serializing and deserializing arbitrary Clojure functions
 - Support for serializing and deserializing arbitrary Clojure data structures
 
+[0.1.205]: https://github.com/IGJoshua/coffi/compare/v0.1.192...v0.1.205
 [0.1.192]: https://github.com/IGJoshua/coffi/compare/v0.1.184...v0.1.192
 [0.1.184]: https://github.com/IGJoshua/coffi/compare/v0.1.176...v0.1.184
 [0.1.176]: https://github.com/IGJoshua/coffi/compare/v0.1.169...v0.1.176
diff --git a/README.md b/README.md
index c5ac49a..49ff808 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,8 @@ This library is available on Clojars. Add one of the following entries to the
 `:deps` key of your `deps.edn`:
 
 ```clojure
-org.suskalo/coffi {:mvn/version "0.1.192"}
-io.github.IGJoshua/coffi {:git/tag "v0.1.192" :git/sha "9d65f47"}
+org.suskalo/coffi {:mvn/version "0.1.205"}
+io.github.IGJoshua/coffi {:git/tag "v0.1.205" :git/sha "0149012"}
 ```
 
 If you use this library as a git dependency, you will need to prepare the
diff --git a/src/clj/coffi/ffi.clj b/src/clj/coffi/ffi.clj
index 6fa1e32..bfb497f 100644
--- a/src/clj/coffi/ffi.clj
+++ b/src/clj/coffi/ffi.clj
@@ -108,9 +108,10 @@
 (defn- insn-layout
   "Gets the type keyword or class for referring to the type in bytecode."
   [type]
-  (if (some-> (mem/primitive-type type) (not= ::mem/pointer))
-    (keyword (name type))
-    (mem/java-layout type)))
+  (when-some [prim (mem/primitive-type type)]
+    (if (not= prim ::mem/pointer)
+      (keyword (name prim))
+      (mem/java-layout type))))
 
 (def ^:private unbox-fn-for-type
   "Map from type name to the name of its unboxing function."
@@ -320,7 +321,7 @@
                      [:getfield :this "upcall_ifn" IFn]
                      (map-indexed
                       (fn [idx arg]
-                        [[(load-instructions arg :aload) (inc idx)]
+                        [[(load-instructions (mem/primitive-type arg) :aload) (inc idx)]
                          (to-object-asm arg)])
                       arg-types)
                      [:invokeinterface IFn "invoke" (repeat (inc (count arg-types)) Object)]
@@ -503,7 +504,7 @@
                    (s/or :string string?
                          :symbol simple-symbol?))
           :native-arglist (s/coll-of ::mem/type :kind vector?)
-          :return-type qualified-keyword?
+          :return-type ::mem/type
           :wrapper (s/?
                     (s/cat
                      :native-fn simple-symbol?
@@ -581,7 +582,11 @@
                               (or old-list
                                   (seq arglists)
                                   (list
-                                   (mapv (comp symbol name)
+                                   (mapv (fn [type]
+                                           (-> (cond-> type
+                                                 (vector? type) first)
+                                               name
+                                               symbol))
                                          (:native-arglist args)))))))
                    (assoc (:attr-map args)
                           ::address address)))
diff --git a/src/clj/coffi/mem.clj b/src/clj/coffi/mem.clj
index 69118f6..a237442 100644
--- a/src/clj/coffi/mem.clj
+++ b/src/clj/coffi/mem.clj
@@ -128,7 +128,14 @@
 (defn null?
   "Checks if a memory address is null."
   [addr]
-  (.equals (MemoryAddress/NULL) addr))
+  (or (.equals (MemoryAddress/NULL) addr) (not addr)))
+
+(defn address?
+  "Checks if an object is a memory address.
+
+  `nil` is considered an address."
+  [addr]
+  (or (nil? addr) (instance? MemoryAddress addr)))
 
 (defn slice-global
   "Gets a slice of the global address space.
@@ -315,20 +322,22 @@
 (defmethod serialize* :default
   [obj type _scope]
   (if-let [prim (primitive-type type)]
-    ((primitive-cast prim) obj)
+    (when-not (= ::void prim)
+      ((primitive-cast prim) obj))
     (throw (ex-info "Attempted to serialize a non-primitive type with primitive methods"
                     {:type type
                      :object obj}))))
 
 (defmethod serialize* ::pointer
   [obj type scope]
-  (when-not (null? obj)
+  (if-not (null? obj)
     (if (sequential? type)
       (with-acquired [scope]
         (let [segment (alloc-instance (second type) scope)]
           (serialize-into obj (second type) segment scope)
           (address-of segment)))
-      obj)))
+      obj)
+    (MemoryAddress/NULL)))
 
 (defmulti serialize-into
   "Writes a serialized version of the `obj` to the given `segment`.
@@ -352,7 +361,7 @@
 (defmethod serialize-into :default
   [obj type segment scope]
   (if-some [prim-layout (primitive-type type)]
-    (with-acquired [(segment-scope scope) scope]
+    (with-acquired [(segment-scope segment) scope]
       (serialize-into (serialize* obj type scope) prim-layout segment scope))
     (throw (ex-info "Attempted to serialize an object to a type that has not been overriden"
                     {:type type