[issue11628] cmp_to_key generated class should use __slots__

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

I think this is a good idea.
Am not sure whether it should be backported though.

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assignee:  -> rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11628>
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