code: public final void writeAndFlushToAllExcept(Packet packet, Collection<? extends Client> clients) {
          writeHelper(packet::writeAndFlush, clients);
      }
docs: Queues a {@link Packet} to a one or more {@link Client}s and calls {@link Client#flush()}, flushing all
  previously-queued packets as well.
  
  @param clients A {@link Collection} of {@link Client}s to exclude from receiving the {@link Packet}.