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This bug happens not just with operators, but with any call self.call_something()! For example, running this:
 from __future__ import print_function
 import weakref
 class Test(object):
 def method(self):
 return type(self)
 def test(obj):
 print(type(obj), "=>", obj.method())
 o = Test()
 test(o)
 test(weakref.proxy(o))
(also attached for convenience as t.py) 
produces in both python2.7 and python3.2:
$ python t.py 
<class '__main__.Test'> => <class '__main__.Test'>
<type 'weakproxy'> => <class '__main__.Test'>