[issue17810] Implement PEP 3154 (pickle protocol 4)

[Antoine Pitrou]

Antoine Pitrou added the comment:

> I think it could be worthwhile to investigate a generic API for
> pickling collections in-place. For example, a such API would helpful
> for pickling set subclasses in-place.

Is the use case important enough? Otherwise, this is more
__special_method__ complication that we'll have to maintain for pickle's
only use.

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