[issue23326] Remove redundant __ne__ implementations

[Guido van Rossum]

Guido van Rossum added the comment:

I'm a little surprised you didn't get pushback from asyncio (i.e. Victor). We try to keep the source identical across releases while asyncio is in provisional mode (i.e. until 3.5 is released).

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nosy: +gvanrossum, haypo

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<http://bugs.python.org/issue23326>
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