Why can't objects be used in python sets?  Example:

>>> [u.username for u in User.objects.all()]
['bar', 'foo', 'foobar']
>>> a = User.objects.filter(username__contains='foo')
>>> b = User.objects.filter(username__contains='bar')
>>> set.intersection(set(a), set(b))
set([])

but...

>>> a
[<User: foo>, <User: foobar>]
>>> b
[<User: bar>, <User: foobar>]
>>> a[1] == b[1]
True


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