[issue26915] Test identity first in membership operation of ItemsView, ValuesView and Sequence in collections.abc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1c6cf4010df3 by Raymond Hettinger in branch 'default':
Issue 26915:  Add identity checks to the collections ABC __contains__ methods.
https://hg.python.org/cpython/rev/1c6cf4010df3

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nosy: +python-dev

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<http://bugs.python.org/issue26915>
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