code: function(data) {
        return Enc.foldType({
          'folktale:Maybe.Nothing': function() {
            return Maybe.Nothing()
          },
          'folktale:Maybe.Just': function(data) {
            return Maybe.Just(data.value)
          }
        })
      }
docs: JSON parsing (with Encoding.JSON)
  
  @method
  @summary @Maybe[α] => Object → Maybe[β]