code: func ttlRounder(ttl int) int {
  	for _, validTTL := range []int{60, 300, 900, 1800, 3600, 21600, 43200, 86400, 172800, 259200, 604800, 1209600} {
  		if ttl <= validTTL {
  			return validTTL
  		}
  	}
  
  	return 2592000
  }
docs: // https://www.cloudns.net/wiki/article/58/
  // Available TTL's:
  // 60 = 1 minute
  // 300 = 5 minutes
  // 900 = 15 minutes
  // 1800 = 30 minutes
  // 3600 = 1 hour
  // 21600 = 6 hours
  // 43200 = 12 hours
  // 86400 = 1 day
  // 172800 = 2 days
  // 259200 = 3 days
  // 604800 = 1 week
  // 1209600 = 2 weeks
  // 2592000 = 1 month