[issue23290] Faster set copying

[Roundup Robot]

Roundup Robot added the comment:

New changeset 79c884cc9625 by Raymond Hettinger in branch 'default':
Issue #23290:  Optimize set_merge() for cases where the target is empty.
https://hg.python.org/cpython/rev/79c884cc9625

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nosy: +python-dev

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