[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

@Mark, great idea.  I wish we'd discussed it more at PyCon 2013 when I was working on preserving OrderedDict's O(1) deletion. :)

TBH, I don't have any problems with improvements.  In fact, I'd be quite happy if folks jumped in and improved what I've done or even replaced it entirely.  But at the point (with the feature freeze exception Larry gave) we should land what I have in 3.5 and then target 3.6 for any improvements.

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