@flash-gordon ugh right, gotta figure this out somehow
is there a difference between
Types::Coercible::String.maybe, Types::Maybe::Coercible::String, and Types::Coercible::String.optional?
(other than the fact that the 'maybe' ones aren't available by default)
looks like this page is out of date (?) http://dry-rb.org/gems/dry-types/optional-values/