Object.is should use SameValue

src/v8natives.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Boolean = global.Boolean;
 // var $Number = global.Number;
 // var $Function = global.Function;
@@ skipping 1348 matching lines @@
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("called_on_non_object", ["Object.isExtensible"]);
   }
   if (%IsJSProxy(obj)) {
     return true;
   }
   return %IsExtensible(obj);
 }
 
 
-// Harmony egal.
+// ECMA-262, Edition 6, section 19.1.2.10
 function ObjectIs(obj1, obj2) {
-  if (obj1 === obj2) {
-    return (obj1 !== 0) || (1 / obj1 === 1 / obj2);
-  } else {
-    return (obj1 !== obj1) && (obj2 !== obj2);
-  }
+  return SameValue(obj1, obj2);
 }
 
 
 // ECMA-262, Edition 6, section B.2.2.1.1
 function ObjectGetProto() {
   return %GetPrototype(ToObject(this));
 }
 
 
 // ECMA-262, Edition 6, section B.2.2.1.2
@@ skipping 517 matching lines @@
   }
   if (!IS_SPEC_FUNCTION(method)) {
     throw MakeTypeError('not_iterable', [obj]);
   }
   var iterator = %_CallFunction(obj, method);
   if (!IS_SPEC_OBJECT(iterator)) {
     throw MakeTypeError('not_an_iterator', [iterator]);
   }
   return iterator;
 }