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This is a direct port of @jaw6's pull request https://github.com/rails/rails/pull/492. His cleanly applied to Rails v3.1 and v3.2, and this cleanly applies to v3.0. With yesterday's security patches http://weblog.rubyonrails.org/2013/1/8/Rails-3-2-11-3-1-10-3-0-19-and-2-3-15-have-been-released/ there is now an issue with Rails v3.0 serving XML to any of the latest versions of ActiveResource. Without this, Rails v3.0 can serve XML to ActiveResource consumers that will see `Hash::DisallowedType: Disallowed type attribute: "yaml"`