internal/argreader/empty.go
func EnsureEmpty(r io.Reader, stage string) error {
	buf := _bufPool.Get().(*[]byte)
	defer _bufPool.Put(buf)

	n, err := r.Read(*buf)
	if n > 0 {
		return fmt.Errorf("found unexpected bytes after %s, found (upto 128 bytes): %x", stage, (*buf)[:n])
	}
	if err == io.EOF {
		return nil
	}
	return err
}
func EnsureEmpty(r io.Reader, stage string) error {
	buf := _bufPool.Get().(*[]byte)
	defer _bufPool.Put(buf)

	n, err := r.Read(*buf)
	if n > 0 {
		return fmt.Errorf("found unexpected bytes after %s, found (upto 128 bytes): %x", stage, (*buf)[:n])
	}
	if err == io.EOF {
		return nil
	}
	return err
}
// EnsureEmpty ensures that the specified reader is empty. If the reader is
// not empty, it returns an error with the specified stage in the message.