Parameters won't work for arg(0)

Hi,

I am porting Drigg to Drupal 6. I am VERY nearly there. However, I am unable to do so because of what seems to be a bug in Drupal 6.

If you have something like this:

function foobar_menu(){
  $items['%foobar_id'] = array(
    'page callback' => 'foobar',
    'access arguments' => array('access content'),
    'page arguments' => array(0),
    'type' => MENU_CALLBACK,
  );
}

function foobar_id_load($foobar_id){
  return $foobar_id;
}

The loader is not called. This forum entry has more information about it:

http://drupal.org/node/238346

It really looks like arg(0) is just not considered. This is absolutely _crucial_ in Drigg, which creates entries like http://www.example.com/Category_1 like Digg does.
So, effectively, Drigg cannot be ported until this is fixed...

$100 to anybody who gets a patch that gets committed. Developers, please don't postpone it to Drupal 7.

Marking "critical" because it seems to be a genuine bug with the menu system that prevents something important...

Bye,

Merc.