public final void writeAndFlushToAllExcept(Packet packet, Collection<? extends Client> clients) {
        writeHelper(packet::writeAndFlush, clients);
    }
public final void writeAndFlushToAllExcept ( Packet packet , Collection < ? extends Client > clients ) { writeHelper ( packet :: writeAndFlush , clients ) ; }
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}.