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

[Anthony Sottile]

Anthony Sottile <asottile at umich.edu> added the comment:

Mostly looking for something that says how `create_module` should / shouldn't be implemented (and why `return None` is necessary)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23014>
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