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Author r.david.murray
Recipients Joshua.Chin, ethan.furman, r.david.murray, rhettinger
Date 2014-10-30.17:50:23
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'counter' in the docstrings is in lower case, so that says nothing dispositive.  However, __add__ does an ininstance check, so it is hard to see why __iadd__ does not.

Personally I'd drop the isinstance checks and let the errors bubble up as they may.  Why should subtract explicitly support other data types, but not __sub__/__isub__?  But Raymond's opinion should hold the most weight here.
Date User Action Args
2014-10-30 17:50:23r.david.murraysetrecipients: + r.david.murray, rhettinger, ethan.furman, Joshua.Chin
2014-10-30 17:50:23r.david.murraysetmessageid: <>
2014-10-30 17:50:23r.david.murraylinkissue22766 messages
2014-10-30 17:50:23r.david.murraycreate