[issue23509] Speed up Counter operators

[Roundup Robot]

Roundup Robot added the comment:

New changeset fe4efc0032b5 by Raymond Hettinger in branch '3.5':
Issue #23509: Speed up Counter operators
https://hg.python.org/cpython/rev/fe4efc0032b5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23509>
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