Pretty much no one used it, and it was....weird.

what do you think the result of

    def cmplt((type_a, value_a), (type_b, value_b)):
        return locals()

is? Now granted, you shouldn't do that, but what you think it is? a dict with 4 keys, right? {'type_a': ..., 'value_b': ...}.

That's wrong. It has those four keys, and two more: '.0' and .1', whose values are the packed tuples.

!?!?!