The Tor Browser / file revision

 // Copyright 2009 the Sputnik authors.  All rights reserved.

 // This code is governed by the BSD license found in the LICENSE file.

 /**

  * Number type represented as the double precision 64-bit format IEEE 754

  *

  * @path ch08/8.5/S8.5_A2.1.js

  * @description Use 2^53 + 2 number and do some operation with it

  */

 var x = 9007199254740994.0; /* 2^53 + 2 */

 var y = 1.0 - 1/65536.0;

 var z = x + y;

 var d = z - x;

 if (d !== 0){

   $ERROR('#1: var x = 9007199254740994.0; var y = 1.0 - 1/65536.0; var z = x + y; var d = z - x; d === 0. Actual: ' + (d));

 }