code: func compareFormatString(fmt1, fmt2 string) bool {
  	if fmt1 == fmt2 {
  		return true
  	}
  	if fmt1 == "" || strings.EqualFold(fmt1, "general") {
  		fmt1 = "general"
  	}
  	if fmt2 == "" || strings.EqualFold(fmt2, "general") {
  		fmt2 = "general"
  	}
  	return fmt1 == fmt2
  }
docs: // Format strings are a little strange to compare because empty string needs to be taken as general, and general needs
  // to be compared case insensitively.