[issue34632] Port importlib_metadata to Python 3.8

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

@jaraco will be able to answer that better than me.  I actually thought those did return concrete lists.

I also thought that the APIs accepted either a module or a package name, but maybe I'm thinking about importlib.resources.  Again, @jaraco can clarify, but I think the problem is that there's no unambiguous mapping between packages and package names for metadata the way there is for resources.

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<https://bugs.python.org/issue34632>
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