code: func NewMultistream(c io.ReadWriteCloser, proto string) Multistream {
  	return &lazyClientConn{
  		protos: []string{proto},
  		con:    c,
  	}
  }
docs: // NewMultistream returns a multistream for the given protocol. This will not
  // perform any protocol selection. If you are using a MultistreamMuxer, use
  // NewMSSelect.