rails/rails — comment on commit fc956425d405e75bcf310f3e6f08cf201cc8131a
File: actionpack/test/template/form_helper_test.rb line 1020
By pixeltrix:

I still think there's a problem with the new implementation of `to_key`. We're changing the return value in the case where a model isn't persisted from always nil to whatever the current attribute value is - some code maybe relying on the old behaviour.