code: func (o Version) String() string {
  	switch o {
  	case VersionOne:
  		return "Version 1: Based on a 60 Bit Timestamp."
  	case VersionTwo:
  		return "Version 2: Based on DCE security domain and 60 bit timestamp."
  	case VersionThree:
  		return "Version 3: Namespace UUID and unique names hashed by MD5."
  	case VersionFour:
  		return "Version 4: Crypto-random generated."
  	case VersionFive:
  		return "Version 5: Namespace UUID and unique names hashed by SHA-1."
  	default:
  		return "Unknown: Not supported"
  	}
  }
docs: // String returns English description of version.