[issue11707] Create C version of functools.cmp_to_key()

[Raymond Hettinger]

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

> why keyobject_type needed traverse function?

I used to know this but don't any more.  It might not be necessary.  Most of the types I write all use GC so it may just be habit.

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<http://bugs.python.org/issue11707>
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