src/client/pkg/pbutil/pbutil.go
func NewReadWriter(rw io.ReadWriter) ReadWriter {
	return &readWriter{r: rw, w: rw}
}
func NewReadWriter(rw io.ReadWriter) ReadWriter {
	return &readWriter{r: rw, w: rw}
}
// NewReadWriter returns a new ReadWriter with rw as both its source and its sink.