If you used the ruby 1.9 syntax then it wouldn't be. However, ruby 1.9 still supported the old syntax, so libraries in 1.9 could still be used with 1.8. There

If you used the ruby 1.9 syntax then it wouldn't be. However, ruby 1.9 still supported the old syntax, so libraries in 1.9 could still be used with 1.8. There wasn't "one right way" to do things in ruby.