[issue22766] collections.Counter's in-place operators should return NotImplemented for unsupported types

[R. David Murray]

R. David Murray added the comment:

I agree with Raymond about the value of the more specific error message.  And the point about the in-place operators being qualitatively different from the non-inplace operators is a good one.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22766>
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