[issue19256] Optimize marshal format and add version token.

[STINNER Victor]

STINNER Victor added the comment:

"I actually agree with Kristjan that an opcode is the least disruptive
choice here."

Does you mean that data serialized with python 3.3 can be read with
python 3.4? But not the opposite (version token unknown in Python
3.3)?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19256>
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