[issue32422] Make OrderedDict can be used for LRU from C

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

I found odict.pop() and odict.popitem() is very inefficient because
it look up key multiple times.
odict seems not optimized well and very slow than dict in some area...

I'll try to optimize it in holidays.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32422>
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