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Class decorator that fills in missing ordering methods from __cmp__.

This lets us take a class defined for Python 2's ordering system (using __cmp__) and use it with minimal changes — just a decorator — in Python 3.

This implementation is adapted from the Python 2 version of functools.total_ordering, which derives these methods from each other instead of from __cmp__.

cls The class to decorate.

The decorated class.