code: func FromGlobalID(globalID string) *ResolvedGlobalID {
  	strID := ""
  	b, err := base64.StdEncoding.DecodeString(globalID)
  	if err == nil {
  		strID = string(b)
  	}
  	tokens := strings.Split(strID, ":")
  	if len(tokens) < 2 {
  		return nil
  	}
  	return &ResolvedGlobalID{
  		Type: tokens[0],
  		ID:   tokens[1],
  	}
  }
docs: /*
  Takes the "global ID" created by toGlobalID, and returns the type name and ID
  used to create it.
  */