code: function reconstituteType(name, typeSpec) {
      if (name.substr(-2) === '[]') { // i.e. endsWith('[]')
          var subtypeName = name.slice(0, -2);
          return new types['array'](subtypeName);
      }
  
      var type = types[name];
      if (typeof type === 'function') {
          type = new type(typeSpec);
      }
      return type;
  }
docs: See description of #exports.registerType()