rails/strong_parameters — pull request #12 by Flink (2012-03-28 08:55:14+00:00)
Title: Added ActionController::Parameters#dup to retain permit state.

I have currently problems with the params hash passed to ActiveRecord. It seems a dup is made on the params argument, and so it does not retain the permit state.
With this patch, when a dup of params is made, if permitted? was true, it still will be.
Don’t know if there’s a better way to do that, but it’s working for me and my colleagues :)