Strange behavior with classes deriving from object and weakrefs.

[Jeremy Fincher]

I can't say much more than the code itself:

>>> import gc, sys, weakref
>>> class O(object):
	pass

>>> o = O()
>>> d = weakref.WeakValueDictionary()
>>> d['o'] = o
>>> d['O'] = O
>>> d.items()
[('O', <class '__main__.O'>), ('o', <__main__.O object at 0x00A116F8>)]
>>> del o
>>> del O
>>> gc.collect()
0
>>> d.items()
[('O', <class '__main__.O'>)]
>>> sys.getrefcount(d['O'])
5

Whence came those 5 references?

Jeremy