Actually, the limited precision is the default (caused by the numerator as well as the denominator having to fit in a 64-bit integer). By default, when it not

Actually, the limited precision is the default (caused by the numerator as well as the denominator having to fit in a 64-bit integer). By default, when it not longer fits, it will convert to floating point (called Num in Raku). But this behaviour can be set: another alternative is for the numerator and denominator both being big integers. This gives you infinite precision rational numbers, at the expense of potentially needing infinite CPU and/or RAM.