Nadeem Vawda <nadeem.va...@gmail.com> added the comment:

Because the lru_cache decorator doesn't provide any way to invalidate
stale cache entries.

Perhaps I should factor out the duplicated code into a separate class
that can then also be exposed to users of the stdlib. But that would only
apply to 3.3, so the uglier fix is still necessary for older versions.

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<http://bugs.python.org/issue11802>
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