Description:
------------
When I overload the __toString() magic method in the SplFileInfo class or in one 
of it's derivatives it does not work if I concatenate the object with a string.
See the example for a simple demonstration.

Test script:
---------------
class A extends \SplFileInfo
{
    public function __toString() {return ' -expected- ';}
}

$a = new A('/');

// Works
echo $a, $a->__toString(), $a->__toString() . '';

// Does not work - outputs parent::__toString()
echo $a . '';

Expected result:
----------------
-expected-  -expected-  -expected- /