[issue16991] Add OrderedDict written in C

[Stefan Krah]

Stefan Krah added the comment:

It's fine to open other issues, but I'm not happy with the resize()/get_index() situation.  Currently I can't come up even with an informal "proof" that it'll always work (and see #24361).

I think these functions really *need* 100% code coverage.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16991>
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