[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

Here's one solution to the deletion-during-iteration problem.  It makes the iterators track the key rather than the node, at the expense of a sliver of speed on __iter__() and keys().

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Added file: http://bugs.python.org/file30467/cOrderedDict-iterators-by-key.diff

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