Existing bug I ran into earlier

test/tests/dictbacked_attrwrapper.py

+# expected: fail
+# - dict-backed objects don't keep track of their attrwrapper if they had one already.
+
+class C(object):
+    pass
+
+c = C()
+aw = c.__dict__
+
+# Convert the object to be dict-backed:
+aw[1] = 2
+
+# __dict__ might return something else now:
+print c.__dict__ is aw