ArraySplice builtin should return empty array and not alter receiver if invoked with no arguments.

src/array.js

 // Copyright 2010 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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 //     * Redistributions in binary form must reproduce the above
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@@ skipping 574 matching lines @@
 
   result.length = end_i - start_i;
 
   return result;
 }
 
 
 function ArraySplice(start, delete_count) {
   var num_arguments = %_ArgumentsLength();
 
+  if (num_arguments == 0) return [];
+
   var len = TO_UINT32(this.length);
   var start_i = TO_INTEGER(start);
 
   if (start_i < 0) {
     start_i += len;
     if (start_i < 0) start_i = 0;
   } else {
     if (start_i > len) start_i = len;
   }
 
   // SpiderMonkey, TraceMonkey and JSC treat the case where no delete count is
   // given differently from when an undefined delete count is given.
   // This does not follow ECMA-262, but we do the same for
   // compatibility.
   var del_count = 0;
   if (num_arguments > 1) {

[Kevin Millikin (Chromium), 2011/01/31 07:55:11]

This is pretty weird.  It looks like the special case is only for not delete
count if start is given, i.e.:

if (num_arguments != 1) {
  // The normal thing according to the algorithm.
} else {
  del_count = len - start_i;
}

     del_count = TO_INTEGER(delete_count);
     if (del_count < 0) del_count = 0;
     if (del_count > len - start_i) del_count = len - start_i;
   } else {
     del_count = len - start_i;
   }
 
   var deleted_elements = [];
   deleted_elements.length = del_count;
 
@@ skipping 606 matching lines @@
     "lastIndexOf", getFunction("lastIndexOf", ArrayLastIndexOf, 1),
     "reduce", getFunction("reduce", ArrayReduce, 1),
     "reduceRight", getFunction("reduceRight", ArrayReduceRight, 1)
   ));
 
   %FinishArrayPrototypeSetup($Array.prototype);
 }
 
 
 SetupArray();