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Philip Jenvey committed da784fe

we now use __length_hint__

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pypy/doc/cpython_differences.rst

   type and vice versa. For builtin types, a dictionary will be returned that
   cannot be changed (but still looks and behaves like a normal dictionary).
 
-* the ``__len__`` or ``__length_hint__`` special methods are sometimes
-  called by CPython to get a length estimate to preallocate internal arrays.
-  So far, PyPy never calls ``__len__`` for this purpose, and never calls
-  ``__length_hint__`` at all.
-
 
 .. include:: _ref.txt