[issue24254] Make class definition namespace ordered by default

[STINNER Victor]

STINNER Victor added the comment:

> It may be a stretch to get this into 3.5, but the final change should be pretty small.

Changing the default type of class dictionaries is a huge change. IMO it should be deferred to Python 3.6.

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24254>
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