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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

There are few incorrect implementations of __ne__ in the stdlib. Updated patch removes them. May be we should remove all implementations of __ne__ which are redundant now.

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Added file: http://bugs.python.org/file37837/method-not-operator-2.patch

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