rails/rails — pull request #7825 by sikachu (2012-10-03 01:09:51+00:00)
Title: Make Rails.public_path return a Pathname

I've discussed with @tenderlove earlier, and it seems like it make sense to make `Rails.public_path` a Pathname, so you can call Pathname methods on it, such as `.join`. I think this is a useful addition to this method.