  * Type-Tiny
      * improved error messages
          * an ArrayRef[Int] should be able to tell you what elements
            are not Ints
          * if something is not a number, then the Int error message
            should report that; not just report that it's not an Int
      * Improve API for parameterized coercions
      * Consider ways to reduce duplication when definition a type
        constraint coderef plus inline code
      * Related Projects
          * Type-Tiny could be used as a backend for Scalar::Does?
              * if not, certainly a SEE ALSO
          * Release stable version of Types-XSD
          * Release Type-Tie
      * Maybe[`a] should have a coercion if `a does???
      * Documentation
          * See what questions users come up with, and write more
            documentation if necessary
