Make DecodeValue a public class again

`DecodedValue` is now a public class again, allowing custom `NodeCache`
implementations to be created. The class was inadvertently made
package-private in 4.0.0.

Fixes #321.

Author: oschwald

CHANGELOG.md

@@ -1,6 +1,13 @@
 CHANGELOG
 =========
 
+4.0.1 (2025-12-02)
+------------------
+
+* `DecodedValue` is now a public class again, allowing custom `NodeCache`
+  implementations to be created. The class was inadvertently made
+  package-private in 4.0.0. Reported by Alexandros Leventakis. GitHub #321.
+
 4.0.0 (2025-11-10)
 ------------------
 

src/main/java/com/maxmind/db/DecodedValue.java

@@ -1,9 +1,16 @@
 package com.maxmind.db;
 
 /**
- * {@code DecodedValue} is a wrapper for the decoded value and the number of bytes used
- * to decode it.
- *
- * @param value the decoded value
+ * {@code DecodedValue} is a wrapper for the decoded value.
  */
-record DecodedValue(Object value) {}
+public final class DecodedValue {
+    final Object value;
+
+    DecodedValue(Object value) {
+        this.value = value;
+    }
+
+    Object value() {
+        return value;
+    }
+}