Meta query – How to display a null meta key

Finally, this meta_query works :

'meta_query' => array(
            'relation' => 'OR',
            array(
               'key' => 'votes_average',
               'value' => '6',
               'compare' => '<',
               'type'    => 'NUMERIC',
            ),
            array(
                'key' => 'votes_average',
                'compare' => 'NOT EXISTS',
                'value' => 'null',
            )
        ),

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