code: func (d Data) GetStringsSplit(key string, delim string) []string {
  	if !d.KeyExists(key) || len(d.Values[key]) == 0 {
  		return nil
  	}
  	return strings.Split(d.Values[key][0], delim)
  }
docs: // GetStringsSplit returns the first element in data[key] split into a slice delimited by delim.