One other thought on the docs.  I would like to continue the style of
supplying pure python equivalents to help precisely explain what a
function does (see the itertools docs for an example, also a few
builtins are explained that way and namedtuples too):

+  Equivalent to::
+
+      def numbits(x):
+          'Number of binary bits necessary to represent the integer n'
+          return len(bin(x).lstrip('-0b'))