[issue23403] Use pickle protocol 4 by default?

[Antoine Pitrou]

Antoine Pitrou added the comment:

It is possible to have independent processes communicate together, although that's not the most widely-used feature. See:
https://docs.python.org/3/library/multiprocessing.html#multiprocessing-listeners-clients
Also:
https://docs.python.org/3/library/multiprocessing.html#managers

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