image_downsize filter always gets only false argument, other are not passed

[mariokostelac]

I'm in progress of developing some theme for WordPress and realized that:

add_filter( 'image_downsize', 'mk_image_downsize' );
	function mk_image_downsize()
	{
		var_dump( func_get_args() );
	}

always prints false. image_downsize returns right values, but arguments are not passed to the filter functions.
I think this is caused by line 142 in wp-includes/media.php file.

if ( $out = apply_filters('image_downsize', false, $id, $size) )

False is passed to filter function, but $id and $size are not.

If you want more than one argument passed to your callback, you need to tell WordPress in your add_filter() call.

add_filter( $filter, $callback, $priority = 10, $number_of_args = 1 );

Andew, thank you a lot, I'm sry for posting this as a bug.