[issue11477] Bug in code dispatching based on internal slots

[Armin Rigo]

Armin Rigo <arigo at users.sourceforge.net> added the comment:

Nick: we get a TypeError anyway if we do unsupported things like "lst += None".  It seems to me that you are confusing levels, unless you can point out a specific place in the documentation that would say "never return NotImplemented from __iadd__(), __imul__(), etc."

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