rubinius/rubinius — comment on commit 09f7ef5678740b2544859ac7b7e8b3bce7de9140
File: kernel/common/integer.rb line 103
By evanphx:

I was aware of how mod compares to and in Rubinius when I made this change, yes.

I find it quite odd that 'and' is slower than 'mod' in 1.9.3, almost seems like there might have been a regression inside MRI.