Count nodes for more than one type in function taxonomy_term_count_nodes()

Very often I and other module developers (for example, Ubercart) need to count nodes for more than one types and they need to call taxonomy_term_count_nodes() one time for each type and this generates more than one SQL query.
I think that little modifications to this function doesn't slows Drupal core but adds more functionality to Drupal API.
For example, we can modify function like there:

function taxonomy_term_count_nodes($tid, $type = 0) {
  static $count;

  if (!isset($count[$type])) {
    // $type == 0 always evaluates TRUE if $type is a string
    if (is_numeric($type)) {
      $result = db_query(db_rewrite_sql('SELECT t.tid, COUNT(n.nid) AS c FROM {term_node} t INNER JOIN {node} n ON t.vid = n.vid WHERE n.status = 1 GROUP BY t.tid'));
    }
    elseif(is_array($type)) {
      $result = db_query(db_rewrite_sql("SELECT t.tid, COUNT(n.nid) AS c FROM {term_node} t INNER JOIN {node} n ON t.vid = n.vid WHERE n.status = 1 AND n.type in ('%s') GROUP BY t.tid", implode("','",$type));
    }
    else {
      $result = db_query(db_rewrite_sql("SELECT t.tid, COUNT(n.nid) AS c FROM {term_node} t INNER JOIN {node} n ON t.vid = n.vid WHERE n.status = 1 AND n.type = '%s' GROUP BY t.tid"), $type);
    }
    while ($term = db_fetch_object($result)) {
      $count[$type][$term->tid] = $term->c;
    }
  }
  $children_count = 0;
  foreach (_taxonomy_term_children($tid) as $c) {
    $children_count += taxonomy_term_count_nodes($c, $type);
  }
  return $children_count + (isset($count[$type][$tid]) ? $count[$type][$tid] : 0);
}