What do you mean by bignums? They may refer to either bigints (e.g. JS BigInt, Python int), bigdecimals (e.g. Python decimal.Decimal), or rationals with bigint

What do you mean by bignums? They may refer to either bigints (e.g. JS BigInt, Python int), bigdecimals (e.g. Python decimal.Decimal), or rationals with bigint numerators and denominators (e.g. Python fractions.Fraction) and are very different from others. I believe that only bigints among them are the must-have for practical programming languages, while rationals would be good to have but can be rather easily constructed from bigints anyway. Bigdecimals are harder than what people seem to believe and can't really be a general solution.