The order of evaluation in parseInt is wrong.

src/v8natives.js

Index: src/v8natives.js
===================================================================
--- src/v8natives.js	(revision 9061)
+++ src/v8natives.js	(working copy)
@@ -106,13 +106,16 @@
       // Truncate number.
       return string | 0;
     }
+    string = TO_STRING_INLINE(string);
     radix = radix | 0;
   } else {
+    // The spec says ToString should be evaluated before ToInt32.
+    string = TO_STRING_INLINE(string);
     radix = TO_INT32(radix);
     if (!(radix == 0 || (2 <= radix && radix <= 36)))
       return $NaN;
   }
-  string = TO_STRING_INLINE(string);
+
   if (%_HasCachedArrayIndex(string) &&
       (radix == 0 || radix == 10)) {
     return %_GetCachedArrayIndex(string);