[issue16991] Add OrderedDict written in C

[Raymond Hettinger]

Raymond Hettinger added the comment:

I just looked at the test-collections patch and don't want it committed.  It is full of trivial edits that make it hard to review and doesn't make the test suite better.

It is okay to add some new tests, but I don't want to rearrange the existing code with minor edits.  That will just make it more difficult to maintain the code across versions (it is no fun to backport a fix and then have unnecessary merge conflicts).

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