[issue23014] Don't have importlib.abc.Loader.create_module() be optional

[Brett Cannon]

Brett Cannon added the comment:

I don't think we really need to say anything. If people want default results, simply return None (which is handled for them by importlib.abc.Loader). The only thing changing here is that the method will now be required instead of optional.

I'll post the patch here before I commit to make sure it's all clear.

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<http://bugs.python.org/issue23014>
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