[issue28919] Simplify `_copy_func_details` in unittest.mock

[Berker Peksag]

Berker Peksag added the comment:

Thanks, Jiajun!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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