[issue2953] _zip_directory_cache untested and undocumented

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

That's fortunate, because I can just reassign this to him :)

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assignee: georg.brandl -> brett.cannon
nosy: +brett.cannon

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2953>
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