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> I'm sure there's some subtlety I'm missing, but isn't it actually the same trade-off?

not exactly, unless you consider space efficiency to be an aspect of performance (which is certainly reasonable). a naive implementation of rationals using two int32_t's only covers the range of a single int32_t, despite using as many bits as the double. it's also a trade-off between range and consistent precision, of course.

this certainly isn't some deep insight into number representation, just a quick point for the benefit of people who haven't thought much about rational data types before.

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