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

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

This is slightly backwards incompatible, as some people may depend on the old behavior. Otherwise sounds like a good idea to me.

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nosy: +petri.lehtinen, rhettinger
stage:  -> patch review
versions: +Python 3.3 -Python 3.4

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