[issue11477] Bug in code dispatching based on internal slots

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Armin, I'm not sure returning NotImplemented from __iadd__ is a good idea in this case. It means "+=" on a mutable object may silently fail to mutate in-place - enabling that seems rather questionable.

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nosy: +ncoghlan

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<http://bugs.python.org/issue11477>
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