Bignum#& is 6 times slower in rubinius than in mri.
This counts for approximately 75 percent of the relative slowness in
bm_meteor_contest.rb which itself is 2.8 times slower in rubinius
than in mri.
a = 123456790123456789012345678901234567890
b = a & 27
am working on semi-fancy benchmark/ips version for forthcoming pull request
@kwleland Thank you for digging into this! It's great to shine a light on some of the slower parts of Rubinius. We can't make it better without measuring and reporting on it.