lib/reflect.js
function(target) {
    var success = this.preventExtensions(target);
    success = !!success; // coerce to Boolean
    if (success) {
      var props = this.getOwnPropertyNames(target);
      var l = +props.length;
      for (var i = 0; i < l; i++) {
        var name = props[i];
        success = success &&
          this.defineProperty(target,name,{configurable:false});
      }
    }
    return success;
  }
function(target) {
    var success = this.preventExtensions(target);
    success = !!success; // coerce to Boolean
    if (success) {
      var props = this.getOwnPropertyNames(target);
      var l = +props.length;
      for (var i = 0; i < l; i++) {
        var name = props[i];
        success = success &&
          this.defineProperty(target,name,{configurable:false});
      }
    }
    return success;
  }
function ( target ) { var success = this . preventExtensions ( target ) ; success = ! ! success ; // coerce to Boolean if ( success ) { var props = this . getOwnPropertyNames ( target ) ; var l = + props . length ; for ( var i = 0 ; i < l ; i ++ ) { var name = props [ i ] ; success = success && this . defineProperty ( target , name , { configurable : false } ) ; } } return success ; }
derived traps
derived traps