code: function ArrayType(typeSpec) {
      if (typeSpec instanceof Type) {
          this.subtype = typeSpec;
      }
      else if (typeof typeSpec === 'string') {
          this.subtype = types.getType(typeSpec);
          if (this.subtype == null) {
              throw new Error('Unknown array subtype: ' + typeSpec);
          }
      }
      else {
          throw new Error('Can\' handle array subtype');
      }
  }
docs: A set of objects of the same type