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/** note that prior to the finally ES5 draft SameValue was used for comparisions
and hence NaNs could be found using lastIndexOf **/

ES5Harness.registerTest( {
id: "15.4.4.15-8-10",

path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-10.js",

description: "Array.prototype.lastIndexOf must return correct index (NaN)",

test: function testcase() {
  var _NaN = NaN;
  var a = new Array("NaN",_NaN,NaN, undefined,0,false,null,{toString:function(){return NaN}},"false");
  if (a.lastIndexOf(NaN) === -1)  // NaN matches nothing, not even itself
  {
    return true;
  }
 },

precondition: function prereq() {
  return fnExists(Array.prototype.lastIndexOf);
 }
});