[issue20637] Support key-sharing dictionaries in subclasses

[STINNER Victor]

STINNER Victor added the comment:

> Also, I think this should go into 3.4

I think that it's too late for optimizations in Python 3.4 (RC1 is alread out). It can wait Python 3.5, or maybe 3.4.1.

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nosy: +haypo

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<http://bugs.python.org/issue20637>
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