Release 4.17
PICKLE FIXES:
- Fixed decode crash of escaped single quote (') that sometimes occurs in protocol level 0 pickled strings.
- Made even more fields of the Unpickler class protected so they can be accessed in a subclass.
- Implemented pickle's persistent ID functionality via the new persistentLoad method on the Unpickler, and the PERSID/BINPERSID opcodes.
- Implemented pickle opcodes OBJ and INST (rarely encountered, but still).