Two alternatives:

* Hack strong_parameters to allow nil for array values.
* In every place we expect array values, also allow non-scalar values. I'm not a fan of this as it's a hack and people might overlook it.

Thoughts @jlsherrill @ehelms @parthaa @bbuckingham?

If we do decide to keep this solution, we should probably check how the `deep_munge` method currently looks because I think this was off an old copy.