STINNER Victor added the comment:

Patch version 5: a global counter is now used to set ma_version field of 
dictionaries. The global counter is incremented each time that a dictionary is 
created and each time that a dictionary is modified.

A dictionary version is now unique: two dictionaries cannot have the same 
version. So if a guard stores a version, the check on the version will fail if 
a different dictionary is used.

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Added file: http://bugs.python.org/file41691/dict_version-5.patch

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<http://bugs.python.org/issue26058>
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