[New-bugs-announce] [issue35410] copy.deepcopy does not respect metaclasses with __deepcopy__ implementations

[Eliot Bixby]

New submission from Eliot Bixby <eli.bixby at gmail.com>:

__deepcopy__ implementations on metaclasses are ignored because deepcopy explicitly ignores class objects.

It seems to me that more consistent behavior would be to use a null op as a fallback for class objects that do not have any of the relevant methods implemented (deepcopy, reduce, reduce_ex, etc)

I've attached a PR that implements this.

----------
components: Library (Lib)
messages: 331073
nosy: elibixby
priority: normal
pull_requests: 10144
severity: normal
status: open
title: copy.deepcopy does not respect metaclasses with __deepcopy__ implementations
type: behavior
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35410>
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