[issue29431] Add a PYTHONREVERSEDICTKEYORDER environment variable

[INADA Naoki]

INADA Naoki added the comment:

At least, ordering of namespace dict and kwargs dict are language spec for 3.6.
This option breaks it.  When this option is set, CPython 3.6 is not Python 3.6.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29431>
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