message: imp(middleware-io): refinement -> brand
diff: @@ -4,12 +4,20 @@ import { defaultReporter } from '../io.reporter';
  describe('#defaultReporter', () => {
  let input;
  + interface NumberAdultBrand {
  + readonly NumberAdult: unique symbol;
  + }
  +
  const schema = t.type({
  user: t.type({
  id: t.string,
  firstName: t.string,
  lastName: t.string,
  - age: t.refinement(t.number, age => age >= 18, 'NumberAdult'),
  + age: t.brand(
  + t.number,
  + (age): age is t.Branded<number, NumberAdultBrand> => age >= 18,
  + 'NumberAdult'
  + ),
  roles: t.array(t.union([
  t.literal('ADMIN'),
  t.literal('GUEST'),
  