code: func Network(network string) Option {
  	return Option(func(c *config) {
  		c.Conn.Network = network
  	})
  }
docs: // Network sets the network (udp, tcp, etc) used by the client. See the
  // net.Dial documentation (https://golang.org/pkg/net/#Dial) for the available
  // network options.
  //
  // By default, network is udp. This option is ignored in Client.Clone().