git clone https://gist.github.com/6267a2e95178a46da23b.git
./bin/rbx -S gem install rmagick
convert demo.bmp demo.jpg
You'll notice the image rendered with -Xint is complete whereas the one with JIT isn't
What you see in the output is the color (gray mostly with JIT on).
This check passed wrongly when neither of the arguments was a fixnum.
This changes the check to make sure that or'ing and and'ing the tags
both result in a tag equal to the fixnum tag.