Lukas Diekmann avatar Lukas Diekmann committed c854a2e

fixed test in lib-python/modified-2.7/test_weakref and adjusted cpython-differences documentation

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             self.assertTrue(v is value2)
         k, v = weakdict.popitem()
         self.assertTrue(len(weakdict) == 0)
-        if k is key1:
+        if k == key1:
             self.assertTrue(v is value1)
             self.assertTrue(v is value2)


   never a dictionary as it sometimes is in CPython. Assigning to
   ``__builtins__`` has no effect.
+* object identity of immutable keys in dictionaries is not necessarily preserved.
+  Never compare immutable objects with ``is``.
 .. include:: _ref.txt
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