code: function xor_64_2(a, b)
  	{
  		return new Int_64(
  			a.highOrder ^ b.highOrder,
  			a.lowOrder ^ b.lowOrder
  		);
  	}
docs: XORs two given arguments.
  
  @private
  @param {Int_64} a First argument to be XORed
  @param {Int_64} b Second argument to be XORed
  @return {Int_64} The XOR of the arguments