I am having a bit of trouble getting nested_form working with strong_paramters.

nested_form adds a "new" to the autogenerated ID, see #21 but strong_parameters only supports nested attributes keys containg only numeric values negative or positive numbers.

I have created a pull request adding a failed test to strong parameters rails/strong_parameters#40 but i would like to hear your opinion regarding this matter. I would think it is quite difficult getting strong_parameters working with "new"