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Do you know that AS::OrderedHash is an array within array, and it's very slow? Hash in 1.9 is written in C, and doesn't suffer the same slowness.
- Prem
--
We won't remove it until Rails 4. Even then, I'm not sure it will be
removed. It will just == Hash.
--
Aaron Patterson
http://tenderlovemaking.com/
https://github.com/rails/rails/blob/master/activesupport/lib/active_support/ordered_hash.rb#L51
Thanks for sharing :)