[issue18864] Implementation for PEP 451 (importlib.machinery.ModuleSpec)

[Nick Coghlan]

Nick Coghlan added the comment:

Just a heads up - since the two of you appear to have this well in hand,
don't wait for a review from me before committing it. I have plenty of
other things to look at before the beta deadline :)

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<http://bugs.python.org/issue18864>
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