Armin Rigo committed 5c7fa43

Document __len__/__length_hint__.

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   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