code: func isPrintable(name string) bool {
  	notASCII := func(r rune) bool {
  		return !unicode.IsPrint(r)
  	}
  	return strings.IndexFunc(name, notASCII) == -1
  }
docs: // isPrintable is used by CDSPackage and SignedCDSPackage validation to
  // detect garbage strings in unmarshaled proto fields where printable
  // characters are expected.