Description:
------------
Typecasting an object with a __toString() function returns the string 'Object' and doesn't run __toString().

Reproduce code:
---------------
<?php
class Foobar
{
.....public function __toString ()
.....{
..........echo '__toString() was run.', "\n";
..........return ('./includes/foobar.php');
.....}
}

$foobar = new Foobar ();
require ((string) $foobar);
?>

Expected result:
----------------
__toString() was run.

require ('./includes/foobar.php');

Actual result:
--------------
require ('Object');