func MustDecode(expected VersionByte, src string) []byte {
	d, err := Decode(expected, src)
	if err != nil {
		panic(err)
	}
	return d
}
func MustDecode(expected VersionByte, src string) []byte {
	d, err := Decode(expected, src)
	if err != nil {
		panic(err)
	}
	return d
}
// MustDecode is like Decode, but panics on error