docs: @Local
      public final CompletableFuture<Integer> sendMessage(final Convert convert, final Object message0, final boolean last, final Stream<? extends Serializable> userids) {
          Object[] array = userids.toArray();
          Serializable[] ss = new Serializable[array.length];
          for (int i = 0; i < array.length; i++) {
              ss[i] = (Serializable) array[i];
          }
          return sendMessage(convert, message0, last, ss);
      }