Prepare for 4.2.0 release

- Updated changelog with release date: 2025-11-02
- Updated README version references: 4.1.0 → 4.2.0

Author: jdereg

README.md

@@ -635,7 +635,7 @@ The jar already ships with all necessary OSGi headers and a `module-info.class`.
 To add the bundle to an Eclipse feature or any OSGi runtime simply reference it:
 
 ```xml
-<plugin id="com.cedarsoftware.java-util" version="4.1.0"/>
+<plugin id="com.cedarsoftware.java-util" version="4.2.0"/>
 ```
 
 Both of these features ensure that our library can be seamlessly integrated into modular Java applications, providing robust dependency management and encapsulation.
@@ -646,15 +646,15 @@ To include in your project:
 
 ##### Gradle
 ```groovy
-implementation 'com.cedarsoftware:java-util:4.1.0'
+implementation 'com.cedarsoftware:java-util:4.2.0'
 ```
 
 ##### Maven
 ```xml
 <dependency>
   <groupId>com.cedarsoftware</groupId>
   <artifactId>java-util</artifactId>
-  <version>4.1.0</version>
+  <version>4.2.0</version>
 </dependency>
 ```
 

changelog.md

@@ -1,5 +1,5 @@
 ### Revision History
-#### 4.2.0 (unreleased)
+#### 4.2.0 - 2025-11-02
 > * **FIXED**: `MultiKeyMap` nested Set lookup bug in COLLECTIONS_EXPANDED mode - Fixed size mismatch false negatives when looking up keys containing expanded Collections. In COLLECTIONS_EXPANDED mode, stored keys have expanded size (includes SET_OPEN/SET_CLOSE markers) while lookup keys have un-expanded Collection size. Added skipSizeCheck logic to bypass size comparison for Collection-to-Collection matches in expanded mode, allowing compareCollections() to handle the structural comparison correctly. This fixes lookups failing incorrectly when using nested Sets or Collections as multi-keys.
 >
 > * **IMPROVED**: Code quality improvements from comprehensive IntelliJ IDEA inspection analysis (17 fixes across 5 classes):