Antoine Pitrou added the comment:

Note the issue with this patch is that it may keep keys (with dead values) 
alive longer than necessary:
- this may prevent memory consumption from decreasing
- this may keep alive some system resources

This is ok when keys are small simple objects (strings or tuples), though.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28427>
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