Avoid relying on monkey-patchable things in String.prototype.split.

src/string.js

 // Copyright 2012 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
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@@ skipping 645 matching lines @@
 
   var currentIndex = 0;
   var startIndex = 0;
   var startMatch = 0;
   var result = [];
 
   outer_loop:
   while (true) {
 
     if (startIndex === length) {
-      result.push(%_SubString(subject, currentIndex, length));
+      result[result.length] = %_SubString(subject, currentIndex, length);

[Yang, 2013/06/19 10:30:43]

Wouldn't it be possible to install an indexed getter on Array.prototype to
intercept this?

       break;
     }
 
     var matchInfo = DoRegExpExec(separator, subject, startIndex);
     if (matchInfo == null || length === (startMatch = matchInfo[CAPTURE0])) {
-      result.push(%_SubString(subject, currentIndex, length));
+      result[result.length] = %_SubString(subject, currentIndex, length);
       break;
     }
     var endIndex = matchInfo[CAPTURE1];
 
     // We ignore a zero-length match at the currentIndex.
     if (startIndex === endIndex && endIndex === currentIndex) {
       startIndex++;
       continue;
     }
 
-    result.push(%_SubString(subject, currentIndex, startMatch));
+    result[result.length] = %_SubString(subject, currentIndex, startMatch);
 
     if (result.length === limit) break;
 
     var matchinfo_len = NUMBER_OF_CAPTURES(matchInfo) + REGEXP_FIRST_CAPTURE;
     for (var i = REGEXP_FIRST_CAPTURE + 2; i < matchinfo_len; ) {
       var start = matchInfo[i++];
       var end = matchInfo[i++];
       if (end != -1) {
-        result.push(%_SubString(subject, start, end));
+        result[result.length] = %_SubString(subject, start, end);
       } else {
-        result.push(void 0);
+        result[result.length] = void 0;
       }
       if (result.length === limit) break outer_loop;
     }
 
     startIndex = currentIndex = endIndex;
   }
   return result;
 }
 
 
@@ skipping 295 matching lines @@
     "fixed", StringFixed,
     "italics", StringItalics,
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup
   ));
 }
 
 SetUpString();