Description:
------------
The ReflectionClass::isSubclassOf() returns TRUE when passing a ReflectionClass object of the same class as parameter. A class is not a subclass of itself, however.

Reproduce code:
---------------
<?php

  class Object { }
  
  $objectClass= new ReflectionClass('Object');
  var_dump($objectClass->isSubclassOf($objectClass));

?>


Expected result:
----------------
bool(false)

Actual result:
--------------
bool(true)