[issue29289] Convert OrderedDict methods to Argument Clinic

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I have added other comments on Rietveld (mostly about docstrings).

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29289>
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