[issue13121] collections.Counter's += copies the entire object

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 5cced40374df by Raymond Hettinger in branch 'default':
Issue #13121: Support in-place math operators for collections.Counter().
http://hg.python.org/cpython/rev/5cced40374df

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13121>
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