Description:
------------
Problem with function round()
rounded value is incorrect

Reproduce code:
---------------
ini_set("precision", 15);
bcscale(5);
$a1 = (string)(3845349 * 34.065);
$a2 = (float)(3845349 * 34.065);
$a3 = bcmul(3845349, 34.065);
echo "A1 = ";
var_dump($a1);
echo("<br />");
echo "A2 = ";
var_dump($a2);
echo("<br />");
echo "A3 = ";
var_dump($a3);
echo "<br />Values after round() :";
echo "<br />A1 = ".round(  $a1 ,2);
echo "<br />A2 = ".round(  $a2 ,2);
echo "<br />A3 = ".round(  $a3 ,2);

Expected result:
----------------
A1 = string(13) "130991813.685" 
A2 = float(130991813.685) 
A3 = string(13) "130991813.685" 
Values after round() :
A1 = 130991813.69
A2 = 130991813.69
A3 = 130991813.69

Actual result:
--------------
A1 = string(13) "130991813.685" 
A2 = float(130991813.685) 
A3 = string(13) "130991813.685" 
Values after round() :
A1 = 130991813.69
A2 = 130991813.68
A3 = 130991813.69