rails/coffee-rails — comment on commit eb46523509c99fb9d19fdc1d1d690fc5c054d94c
File:  line 0
By spastorino:

Because the previous one was released using Ruby 1.9 and some people were having issues https://github.com/rails/coffee-rails/issues/19.
http://blog.rubygems.org/2011/08/31/shaving-the-yaml-yak.html