Following up: while sage's "RationalNumber" is indeed a numbers.Rational according to "isinstance", it does not actually adhere to the stated API: "numerator" and "denominator" are supposed to be properties, but in sage they are methods. So even in places where we are trying to fit into "Number" we are already failing. Changing the way that "numerator" and "denominator" behave would break a *LOT* of sage code. I don't think we can do it.
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