Introduce an API to force the deletion of a property ignoring...

src/v8natives.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 97 matching lines @@
 
 // ECMA-262 - 15.1.2.3
 function GlobalParseFloat(string) {
   return %StringParseFloat(ToString(string));
 }
 
 
 function GlobalEval(x) {
   if (!IS_STRING(x)) return x;
 
-  if (this !== global && this !== %GlobalReceiver(global)) {
-    throw new $EvalError('The "this" object passed to eval must ' + 
+  var global_receiver = %GlobalReceiver(global);
+  var this_is_global_receiver = (this === global_receiver);
+  var global_is_detached = (global === global_receiver);
+
+  if (!this_is_global_receiver || global_is_detached) {
+    throw new $EvalError('The "this" object passed to eval must ' +
                          'be the global object from which eval originated');
   }
-  
+
   var f = %CompileString(x, false);
   if (!IS_FUNCTION(f)) return f;
 
   return f.call(this);
 }
 
 
 // execScript for IE compatibility.
 function GlobalExecScript(expr, lang) {
   // NOTE: We don't care about the character casing.
@@ skipping 427 matching lines @@
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();