[issue23403] Use pickle protocol 4 by default?

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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dependencies: +Repeated Pickler.dump() doesn't reset the state in the C implementation of pickle
superseder: parameterize what serialization is used in multiprocessing -> 

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23403>
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