hash_to_array -i <key, value> =
{
  ...

  @desc
  {
    hash_to_array -i <key, value> ++ hash_to_array <key, value>;
  }
}

array_hash_table <key, value> =
{
  ...

  @desc
  {
    array_hash_table <key, value> ++ hash_map <key, value>
                                  ++ array_list <key, value>
                                + ++ hash_to_array <key, value>;               /*  mixin + interface */
  }
};