[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

@mrab

gah! I could swear I originally had the _odict_clear_node first and had switched them due to a segfault.  It even crossed my mind on Friday but I didn't pursue it.  I'm guessing I did put the _odict_clear_node call first at some point but lost that fix along the way. :(  That's the "benefit" of having a patch languish for so long; you end up working on it from multiple hosts and sometimes lose bits and pieces.  Unfortunately only recently did I think to create a feature repo on which to track the on-going work.

Anyway, thanks for helping with the investigation.  The patch should be just about ready to commit at this point. :)  I'm going to give it a once over, check for any lingering ref leaks, and double-check with Raymond.  So I'm hopeful we can land this in the next few days.

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<http://bugs.python.org/issue16991>
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