[Python-Dev] Why is pickle.DEFAULT_PROTOCOL still 3?

[Lukasz Langa]

Pickle protocol version 4.0 was originally defined back in PEP 3154 and shipped as part of Python 3.4 back in 2011. Yet it's still not the default. There's a number of things that would run faster with it like multiprocessing.

This is too late for 3.7 which is a shame but can we at least bump it for 3.8?

- Ł
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