Description:
------------
The declaration of getMessage() as final in the SPLs Exception class makes it impossible to encapsulate other (Userland-)Exceptions and provide appropriate functionality.


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

class UserException extends Exception {

private $encapsulatedException = null;

public function __construct($message = null, $e = null)
{
    if ($e !== null && ($e instanceof Exception) {
    $this->encapsulatedException = $e;
    } else {
   $this->encapsulatedException = null;
 
}
    parent::__construct($message);
}

public function getMessage()
{
   $message = parent::getMessage();
    if ($message == null && $this->encapsulatedException !== null) {
    echo $this->encapsulatedException->getMessage();
}
}

}

?>

Expected result:
----------------
It should be possible to override the getMessage()-method to decide wether to return the message the object was instantiated with or the message of the encapsulated Exception.

Actual result:
--------------
Fatal error: Cannot override final method Exception::getMessage()