rails/rails — pull request #8158 by steveklabnik (2012-11-09 14:24:51+00:00)
Title: Deprecate Hash#diff.

It's no longer used in Rails any more.

See https://github.com/rails/rails/pull/8142\#issuecomment-10227297 for more.

I didn't add a CHANGELOG yet because I wanted to make sure the rest was okay. Let me know and I'll add it.