hey, thanks for all the great work with macruby! i'm experiencing a difference in floating point behaviour between mri and the latest macruby 0.7 nightly:
~$ ruby -v ruby 1.8.7 (2009-06-08 patchlevel 173) [universal-darwin10.0] ~$ ruby -e "z = 0.034228469425; puts Math.sqrt(z*z) < z" false ~$ ruby -e "z = 0.034228469424; puts Math.sqrt(z*z) < z" false ~$ macruby -v MacRuby 0.7 (ruby 1.9.2) [universal-darwin10.0, x86_64] ~$ macruby -e "z = 0.034228469425; puts Math.sqrt(z*z) < z" false ~$ macruby -e "z = 0.034228469424; puts Math.sqrt(z*z) < z" true notice how that last script outputs true instead of false. also i'm seeing this difference with floats: ~$ ruby -e "puts 8.1" 8.1 ~$ macruby -e "puts 8.1" 8.09999999999999 this difference is causing trouble because asin() might fail even when the input seems to be 1.0: z = 0.034228469424 r = Math.sqrt z*z puts d = z/r # => 1.0 puts d>1.0 # false with mri, but true with macruby puts Math.asin d # => 1.5707963267949 with mri, but error with macruby (since d>1.0) -emil
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