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

[Filip Gruszczyński]

Filip Gruszczyński <gruszczy at gmail.com> added the comment:

I have a follow-up question: why keyobject_type needed traverse function? From what I read in docs I assumed it is required for GC tracked types. Why was it required here and how it is used?

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