code: @SafeVarargs
      public final <T extends Client> void flushToAllExcept(T... clients) {
          writeHelper(Client::flush, clients);
      }
docs: Flushes all queued {@link Packet}s for all {@link Client}s except the one(s) specified.
  
  @param <T> A {@link Client} or any of its children.
  @param clients A variable amount of {@link Client}s to exclude from receiving the {@link Packet}.