base57.go
func (b base57) Decode(u string) (uuid.UUID, error) {
	str, err := b.stringToNum(u)
	if err != nil {
		return uuid.Nil, err
	}
	return uuid.Parse(str)
}
func (b base57) Decode(u string) (uuid.UUID, error) {
	str, err := b.stringToNum(u)
	if err != nil {
		return uuid.Nil, err
	}
	return uuid.Parse(str)
}
// Decode decodes a string according to the alphabet into a uuid.UUID. If s is
// too short, its most significant bits (MSB) will be padded with 0 (zero).