[issue40117] __round__ doesn't behave well with return NotImplemented

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Agreed with Eric and Serhiy. This seems to be a misunderstanding about the scope of NotImplemented.

@Hameer Abbasi: if you have an example of a problem that would be solved by this behaviour change, and which can't be solved simply by raising TypeError or another exception within __round__, feel free to open a discussion on the python-ideas mailing list.

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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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<https://bugs.python.org/issue40117>
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