[issue10042] functools.total_ordering fails to handle NotImplemented correctly

[Nick Coghlan]

Nick Coghlan added the comment:

I think I spotted a logic bug in _not_op_and_not_eq (it uses "or" instead
of  "and" in the final line) , so I suspect we still have a missing test
case in the latest patch. (My fault - I should have suggested using
coverage.py to ensure all the branches were covered by the chosen test
cases).

The general structure of the proposed update is complete though.

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