code: func getCountryCodeForValidRegion(regionCode string) int {
  	var metadata *PhoneMetadata = getMetadataForRegion(regionCode)
  	return int(metadata.GetCountryCode())
  }
docs: // Returns the country calling code for a specific region. For example,
  // this would be 1 for the United States, and 64 for New Zealand. Assumes
  // the region is already valid.