[issue6784] byte/unicode pickle incompatibilities between python2 and and python3

[RonnyPfannschmidt]

RonnyPfannschmidt <Ronny.Pfannschmidt at gmx.de> added the comment:

the basic behavior i want to see for all protocols <= 2

1. python 2 string maps to python3 byte-string
2. python 2 unicode maps to python3 string
3. python 3 string map to python 2 unicode 
4. python 3 bytestring maps to python 2 string

anything else is is confusing and may break
for example one can't unpickle '\xFF' in python3 if it was pickled in
python2

note that these changes seem irrelevant for protocol 3 as python2.x
doesn't support it

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6784>
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