[issue25410] Clean up and fix OrderedDict

[Eric Snow]

Eric Snow added the comment:

All 3 patches look fine to me.

In "odict_resize_sentinel.patch", it would be nice if you could accomplish that with a single sentinel.  However, fixing the bug is more critical.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25410>
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