code: func (id Identity) Value() string {
  	chunks := strings.SplitN(string(id), ":", 2)
  	if len(chunks) != 2 {
  		return "anonymous"
  	}
  	return chunks[1]
  }
docs: // Value returns a valued encoded in the identity, e.g. for User identity kind
  // it is user's email address.If identity string is invalid returns "anonymous".