Provide multi-paradigm forking with ability to pass back data

Changes for 2.232041 - 2023-07-23T16:50:17+00:00

• Joelle Maslak <jmaslak@antelope.net>
• Add tests for class objects on 5.38+
• Add documentation caveats about class objects (and also CODE and REGEXP references)
• Add support for objects with FREEZE/THAW methods (use those over other methods)