Object.getOwnPropertyNames should return string names for indexed properties

src/v8natives.js

Index: src/v8natives.js
===================================================================
--- src/v8natives.js	(revision 3865)
+++ src/v8natives.js	(working copy)
@@ -623,9 +623,8 @@
   if (%GetInterceptorInfo(obj) & 1) {
     var indexedInterceptorNames =
         %GetIndexedInterceptorElementNames(obj);
-    if (indexedInterceptorNames) {
+    if (indexedInterceptorNames)
       propertyNames = propertyNames.concat(indexedInterceptorNames);
-    }
   }
 
   // Find all the named properties.
@@ -643,6 +642,10 @@
     }
   }
 
+  // Property names are expected to be strings.
+  for (var i = 0; i < propertyNames.length; ++i)
+    propertyNames[i] = ToString(propertyNames[i]);
+
   return propertyNames;
 }