[issue20383] Add a keyword-only spec argument to types.ModuleType

[Brett Cannon]

Brett Cannon added the comment:

After all the various revelations today about how much of a hassle and murky it would be to get types.ModuleType to do what we were after, I went ahead and kept importlib.util.module_from_spec(), but dropped the module argument bit. I also deconstructed _SpecMethods along the way while keeping the abstractions as Eric requested.

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resolution:  -> fixed
stage: commit review -> resolved
status: open -> closed

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<http://bugs.python.org/issue20383>
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