[issue22540] speed up isinstance and issubclass for the usual cases

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6cfe929d1de5 by Antoine Pitrou in branch 'default':
Make test_datetime a better citizen (issue #22540)
https://hg.python.org/cpython/rev/6cfe929d1de5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22540>
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