no longer makes sense -- all the elements must be comparable to each
other. Note that this does not apply to the ``==`` and ``!=``
operators: objects of different incomparable types always compare
- unequal to each other, and an object always compares equal to itself
- (i.e., ``x is y`` implies ``x == y``; this is true even for *NaN*).
* :meth:`builtin.sorted` and :meth:`list.sort` no longer accept the
*cmp* argument providing a comparison function. Use the *key*