1.8.7 Patch reduces time cost of Rational operations by 50%.
This changes adds a specialize Fixnum#gcd and a tuned rational.rb.
Reduced overall time on Rational operations by > 50%.
user system total real
test_it 22.380000 2.140000 24.520000 ( 24.559388)
test_it ks_rational 17.870000 1.830000 19.700000 ( 19.687221)
test_it ks_rational + Fixnum#gcd 10.660000 0.000000 10.660000 ( 10.665765)
The patch will perform better with Fixnum#gcd on numeric.c but still is faster with only the rational.rb changes.
I have a version for 1.8.6 if someone wants it.