Defers call to symbolize!
Defers call to symbolize!

Rewrite #_whitelist so it does not depend on the keys in the params
being symbols.  This was done in response to code review.

supriyantomaftuh/controller,theocodes/controller,hanami/controller,lotus/controller,hanami/controller,hanami/controller,weppos/hanami-controller,vyper/controller