Description:
------------
Using FILTER_VALIDATE_EMAIL and FILTER_SANITIZE_EMAIL produces incorrect results. In the first case, valid unicode emails are deemed invalid. In the second case, unicode characters are stripped from a valid unicode email.

Test script:
---------------
<?php

$email = 'Müller@example.org';
$isValid = filter_var($email, FILTER_VALIDATE_EMAIL);
if (!$isValid) {
    echo "Uh-oh, PHP thinks unicode email addresses are invalid \n";
}

$sanitized = filter_var($email, FILTER_SANITIZE_EMAIL);
if ($sanitized !== $email) {
    echo "Not only that, but it destroys valid emails while sanitizing: $sanitized \n";
}


Expected result:
----------------
No output is expected.

Actual result:
--------------
Uh-oh, PHP thinks unicode email addresses are invalid 
Not only that, but it destroys valid emails while sanitizing: Mller@example.org