Message 242949 - Python tracker

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Content 
Proposed patch pickles all ascii strings with protocols < 3 and fix_import=True with compatible opcodes (STRING, BINSTRING and SHORT_BINSTRING). Pickled strings are unpickled as str in Python 2 and Python 3 (unless encoding="bytes").

As a side effect, short ascii strings (length < 256) are pickled more compact with protocols < 3.