[issue28919] Simplify `_copy_func_details` in unittest.mock

[Roundup Robot]

Roundup Robot added the comment:

New changeset bbdfde7958a8 by Berker Peksag in branch 'default':
Issue #28919: Simplify _copy_func_details() in unittest.mock
https://hg.python.org/cpython/rev/bbdfde7958a8

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28919>
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