"X isn't supported natively by processors, so there's no real need to handle this as a primitive instead of letting people to use a library for it" is a general

"X isn't supported natively by processors, so there's no real need to handle this as a primitive instead of letting people to use a library for it" is a general-purpose argument to cherry pick which primitives you support and which ones you don't. Surely this isn't your actual reason you choose to oppose Rationals / BigIntegers as primitives while accepting hashmaps and arrays?