Hi @rafaelfranca, several others (see https://github.com/rails/rails/pull/12333#discussion-diff-8316898, https://github.com/rails/rails/pull/12333#discussion-diff-8351196) brought this up, and I agree that it should be documented somewhere.

Based on the thread in https://github.com/rails/rails/issues/2502, it looks like this has been removed since 3.2. Should I put this under Upgrading from 3.1 to 3.2?