[SUGGESTION] Enums as Arrays

Hi there, my first topic here.

I recently made a monkey patch to use rails enums with pg arrays, and it was reasonably straightforward to do it and I think I could raise a PR to do so, at least as an option for the current Enums.

This gem should solve the issue, but I find that overriding 2 methods was less overhead than adding a whole new gem to my already large bundle.