add java.sql.Date, prevents it from being thawed as java.util.Date

;; used to fail, the thaw value was an instance of the parent `java.util.Date` class
(require '[taoensso.nippy :as nippy])
(let [sql (java.sql.Date/valueOf "2023-05-01")]
  (is (= (type sql)
         (-> sql nippy/freeze nippy/thaw type))))

README.md

@@ -108,6 +108,7 @@ nippy/stress-data
  :uri          (URI. "https://clojure.org/reference/data_structures")
  :uuid         (java.util.UUID/randomUUID)
  :date         (java.util.Date.)
+ :sql-date     (java.sql.Date/valueOf "2023-06-21")
 
  ;;; JVM 8+
  :time-instant  (java.time.Instant/now)

src/taoensso/nippy.clj

@@ -119,6 +119,7 @@
 
    90  [:date     [[:bytes 8]]]
    91  [:uuid     [[:bytes 16]]]
+   92  [:sql-date [[:bytes 8]]]
 
    ;; JVM >=8
    79  [:time-instant  [[:bytes 12]]]
@@ -370,6 +371,7 @@
     "java.net.URI"
     "java.util.UUID"
     "java.util.Date"
+    "java.sql.Date"
 
     #_"java.time.*" ; Safe?
     "java.time.Clock"
@@ -1128,6 +1130,7 @@
   (write-biginteger out (.denominator x)))
 
 (id-freezer Date id-date (.writeLong out (.getTime x)))
+(id-freezer java.sql.Date id-sql-date (.writeLong out (.getTime x)))
 
 (id-freezer URI id-uri
   (write-str out (.toString x)))
@@ -1693,6 +1696,7 @@
                          (read-biginteger in))
 
         id-date        (Date. (.readLong in))
+        id-sql-date    (java.sql.Date. (.readLong in))
         id-uuid        (UUID. (.readLong in) (.readLong in))
         id-uri         (URI. (thaw-from-in! in))
 
@@ -2064,6 +2068,7 @@
    :uri          (URI. "https://clojure.org/reference/data_structures")
    :uuid         (java.util.UUID/randomUUID)
    :date         (java.util.Date.)
+   :sql-date     (java.sql.Date/valueOf "2023-06-21")
 
    ;;; JVM 8+
    :time-instant  (enc/compile-if java.time.Instant  (java.time.Instant/now)                nil)