[issue23509] Counter.__iadd__ falls back to __add__ with bad performance impact

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Support of in-place math operators is already added in issue13121.

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nosy: +rhettinger, serhiy.storchaka
resolution:  -> out of date

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