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This module is an implementation of PEP 205:
http://www.python.org/dev/peps/pep-0205/
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This is used in the WeakValueDictionary to avoid having to create
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callback object can use the 'key' attribute of a KeyedRef instead
of getting a reference to the key from an enclosing scope.
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Entries in the dictionary will be discarded when there is no
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associate additional data with an object owned by other parts of
an application without adding attributes to those objects. This
can be especially useful with objects that override attribute
accesses.
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The references are not guaranteed to be 'live' at the time
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creating references that will cause the garbage collector to
keep the keys around longer than needed.
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