Fail to compare dates in meta_query

I have exact the same problem here, except i use the std. post type (post) and a category in my query. everything works except the sort order.

$d = date("Y-m-d");
$args = array(
    'post_type'         => 'post',
    'category_name'     => 'events',
    'post_status'       => 'publish,draft,pending,future,private', // just for me
    'meta_key'          => 'event_start',
    'orderby'           => 'meta_value_num',
    'order'             => 'ASC',
    'posts_per_page'    => -1,
    'meta_query'        => array(
        array(
            'key' => 'event_start',
            'value' => $d,
            'type' => 'date',
            'compare' => '>'
        )
    )
);

But my posts get sorted by String-Comparison nonetheless. What did i do wrong?

Well after a little trial and error i found out that instead of ‘meta_value_num’ i should’ve used ‘meta_value’:

$d = date("Y-m-d");
$args = array(
    'post_type'             => 'post',
    'category_name'     => 'events',
    'post_status'           => 'publish,draft,pending,future,private',
    'meta_key'              => 'event_start',
    'orderby'               => 'meta_value',
    'order'                     => 'ASC',
    'posts_per_page'        => -1,
    'meta_query'            => array(
        array(
            'key' => 'event_start',
            'value' => $d,
            'type' => 'date',
            'compare' => '>'
        )
    )
);