rational numbers

[Schüle Daniel]

Hello NG,

recently I was using Scheme and Ruby and was really nicely surprised
to find there support for the computing with rational numbers

for example this how it works in Ruby

mond:/pool/PROG/ruby # irb
irb(main):001:0>
irb(main):002:0* require "mathn"
=> true
irb(main):003:0> r = Rational(1,3)
=> 1/3
irb(main):004:0> p = Rational(1,5)
=> 1/5
irb(main):005:0> r+p
=> 8/15
irb(main):007:0> (r+p)**2
=> 64/225
irb(main):008:0>

does anybody know modules which make rational numbers available?
and are there considerations to add them to the core, like
complex numbers (maybe in Python 3)

Regards, Daniel