dst = binary.LittleEndian.AppendUint32(dst, uint32(h))
	}
	return m.parent.send(m.ctx, dst)
}

// RequestStateless will send a single payload request and stream back results.
// req may not be read/written to after calling.
// TODO: Not implemented
func (m *muxClient) RequestStateless(h HandlerID, req []byte, out chan<- Response) {
	if m.init {
		out <- Response{Err: errors.New("mux client already used")}
	}

	client, err := c.newMuxClient(ctx)
	if err != nil {
		return err
	}
	defer c.outgoing.Delete(client.MuxID)
	resp := make(chan Response, 10)
	client.RequestStateless(h, req, resp)

	for r := range resp {
		if r.Err != nil {
			return r.Err
		}
		if len(r.Msg) > 0 {
			err := cb(r.Msg)
			if err != nil {
				if errors.Is(err, ErrDone) {
					break