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

[Brett Cannon]

Brett Cannon added the comment:

No longer blocking b1, now just blocking rc1.

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dependencies: +Update zipimport for PEP 451
priority: release blocker -> deferred blocker

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18864>
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