I think Factor has the best number implementation. It has builtin support for bignums and rationals. Eg: IN: scratchpad 2 63 ^ 1 + 2 63 ^ / 2 63 ^ * 2 63

I think Factor has the best number implementation. It has builtin support for bignums and rationals. Eg: IN: scratchpad 2 63 ^ 1 + 2 63 ^ / 2 63 ^ * 2 63 ^ 1 + = t The corresponding expression would incorrectly evaluate to false in most languages: >>> n = 63 >>> (2**n + 1) / 2**n * 2**n == 2**n + 1 False Factor also has syntactic support for complex numbers but not for irrational ones.