Sort by meta key but include those posts which have no meta key assigned

I want to query post where I can Sort by meta key but include those posts also which have no meta key assigned yet.

$argss = array(
	  	'orderby' => array( 'type' => 'meta_value', 'date' => 'ASC' ) ,
		'meta_key'  => 'type',
		'meta_query'=>	  array(
        'relation' => 'OR',
        array(
                'key' => 'type',
                'compare' => '='
            ),
          array(
                'key' => 'type',
	        'value' => null,
                'compare' => 'NOT EXISTS'
            )
        )
		);