Should tules produce a Set rather than a number?

[dougransom]

in https://fuzzylogic.readthedocs.io/en/latest/Showcase/

print(R1(values), R2(values), R3(values), R4(values), "=>", rules(values))`

rules(values) produces the defuzzified value. I think it should produce a Set, which I can do something with, such as plot it, defuzzify it, a couple different ways, use as an input to some other rule.

Is there a way to to that, or extend the API to add that behavior with something like (rules.as_set(values))?