code: func (m *Memberlist) SendReliable(to *Node, msg []byte) error {
  	return m.sendUserMsg(to.Address(), msg)
  }
docs: // SendReliable uses the reliable stream-oriented interface of the transport to
  // target a user message at the given node (this does not use the gossip
  // mechanism). Delivery is guaranteed if no error is returned, and there is no
  // limit on the size of the message.