Description:
------------
ReflectionParameter.getDefaultValue returning wrong value when default parameter have leading zeros.

Test script:
---------------
<?php
class Foo
{
	public function Bar($n1 = 09, $n2 = 9){
		return 0;
	}
}


$r = new ReflectionObject(new Foo());
$m = $r->getMethod("Bar");
$p1 = $m->getParameters()[0];
$p2 = $m->getParameters()[1];
echo "p1=".$p1->getDefaultValue(); //not ok. expected = 9, returning 0.
echo "<br>";
echo "p2=".$p2->getDefaultValue(); //ok = 9
?>