rails/rails — pull request #5752 by ahoward (2012-04-05 17:39:21+00:00)
Title: more concise, more fast.  and correct.

this pull request should be applied on top of

https://github.com/rails/rails/pull/5750

and addresses all the feedback given: it's concise, fast, and correct.

see

https://gist.github.com/2305719

for speed results