mysqli connect over socket broken

For my website i use a second database which needs a connection using a socket. This will not work with Drupal without hacking core since the database.mysqli.inc does not supply a socket parameter to mysql
How to reproduce:
- add a second database to your settings.php (mind the escaping of the slashes!) this db does not use a user nor password!
$db_url['default'] = 'mysqli://xiffy_nl:j4bb3rw4ky@localhost/xiffy_nl';
$db_url['trackstat'] = 'mysqli://localhost%3A%2Fvar%2Flib%2Fsqueezecenter%2Fcache%2Fsqueezecenter-mysql.sock/slimserver';
somewhere in your code make a call to db_connect('trackstat') which will render a 503 error.

How to patch
line 76 in database.mysqli.inc is crucial and plain wrong. It provides a hard-coded NULL where the socket should have been.
@mysqli_real_connect($connection, $url['host'], $url['user'], $url['pass'], substr($url['path'], 1), $url['port'], NULL, MYSQLI_CLIENT_FOUND_ROWS);
To get the socket from the url provided from settings.php we need a bit more code. Lines 71-76 could be replced by this working code:

  if (strpos($url['host'], ':') > 0) {
    $f = explode(':', $url['host']);
    $url['host'] = $f[0];
    $sock = $f[1];
  } else $sock = NULL;
  $url['path'] = urldecode($url['path']);
  if (!isset($url['port'])) {
    $url['port'] = NULL;
  }

  $connection = mysqli_init();
  @mysqli_real_connect($connection, $url['host'], $url['user'], $url['pass'], substr($url['path'], 1), $url['port'], $sock, MYSQLI_CLIENT_FOUND_ROWS);

cheers xiffy