[issue15502] Meta path finders and path entry finders are different, but share an ABC

[Eric Snow]

Eric Snow added the comment:

Not to detract from the fun <wink> terminology discussion, but I have lingering concerns with the ABC inheritance model here.

Looking over changeset 184700df5b6a, I'm still fine with the change if invalidate_caches() is appropriate for both.  If not or if we don't know yet, I think we should hold off on moving invalidate_caches() up into Finder.  If it is okay then we should add meta path finder traversal to importlib.invalidate_caches().  Either way there's a (not substantial) loose end.

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<http://bugs.python.org/issue15502>
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