hash.rb

module Dry
  module Types
    class Hash < Definition
      class Safe < Hash
        def call(hash, meth = :call)
          member_types.each_with_object({}) do |(key, type), result|
            if hash.key?(key)
              result[key] = type.__send__(meth, hash[key])
            elsif type.is_a?(Default)
              result[key] = type.evaluate
            elsif type.is_a?(Optional)
              result[key] = type[nil]
            end
          end
        end
      end
    end
  end
end