[issue2953] _zip_directory_cache untested and undocumented

[Éric Araujo]

Éric Araujo added the comment:

Eric, as you know importlib, can you comment about this?  If zipimport now works with the invalidate_caches system, then we do have a documented way of clearing the cache, and I would recommend closing this bug (the existing attribute should stay for compat, but we should not document or test it more IMO).

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assignee: tarek -> 
nosy: +eric.snow

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