Fixed bug introduced in my last commit. I forgot to...

src/objects.cc

 // 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 437 matching lines @@
     return value;
   }
   // Preserve enumeration index.
   details = PropertyDetails(details.attributes(),
                             details.type(),
                             property_dictionary()->DetailsAt(entry).index());
   if (IsJSGlobalObject()) {
     JSGlobalPropertyCell* cell =
         JSGlobalPropertyCell::cast(property_dictionary()->ValueAt(entry));
     cell->set_value(value);
-    // No need to update the property dictionary.
+    // Please note we have to update the property details.
+    property_dictionary()->SetStringEntry(entry, name, cell, details);
   } else {
     property_dictionary()->SetStringEntry(entry, name, value, details);
   }
   return value;
 }
 
 
 Object* Object::GetProperty(Object* receiver,
                             LookupResult* result,
                             String* name,
@@ skipping 6869 matching lines @@
   // No break point.
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 
 
 } }  // namespace v8::internal