[issue21408] delegation of `!=` to the right-hand side argument is not always done

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3603bae63c13 by Serhiy Storchaka in branch 'default':
Issue #23326: Removed __ne__ implementations.  Since fixing default __ne__
https://hg.python.org/cpython/rev/3603bae63c13

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<http://bugs.python.org/issue21408>
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