Map -0 to integer 0 for typed array constructors.

src/runtime.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This files contains runtime support implemented in JavaScript.
 
 // CAUTION: Some of the functions specified in this file are called
 // directly from compiled code. These are the functions with names in
 // ALL CAPS. The compiled code passes the first argument in 'this'.
 
@@ skipping 654 matching lines @@
     var valueOf = x.valueOf;
     if (IS_SPEC_FUNCTION(valueOf)) {
       var v = %_CallFunction(x, valueOf);
       if (%IsPrimitive(v)) return v;
     }
   }
   throw %MakeTypeError('cannot_convert_to_primitive', []);
 }
 
 function ToPositiveInteger(x, rangeErrorName) {
-  var i = TO_INTEGER(x);
+  var i = TO_INTEGER_MAP_MINUS_ZERO(x);
   if (i < 0) throw MakeRangeError(rangeErrorName);
   return i;
 }
 
 
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));