[issue26880] Remove redundant checks from set.__init__

[Roundup Robot]

Roundup Robot added the comment:

New changeset ed6345cb08ab by Serhiy Storchaka in branch 'default':
Issue #26880: Removed redundant checks in set.__init__.
https://hg.python.org/cpython/rev/ed6345cb08ab

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26880>
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