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Hm, I forgot about the caching of directory info. I don't think 
properly supporting reloading from zip files is worth the effort. It 
would be nice if it failed nicer, though.

The reload patch is still cool, though, since it should fix reloading 
with PEP 302-style importers in general (yet zipimport may still 
choose not to support it). A reload test in test_importhooks.py 
would be a great addition.