code: func (cfg *dnsConfig) GetTTLForService(service string) (time.Duration, bool) {
  	if cfg.TTLStrict != nil {
  		ttl, ok := cfg.TTLStrict[service]
  		if ok {
  			return ttl, true
  		}
  	}
  	if cfg.TTLRadix != nil {
  		_, ttlRaw, ok := cfg.TTLRadix.LongestPrefix(service)
  		if ok {
  			return ttlRaw.(time.Duration), true
  		}
  	}
  	return 0, false
  }
docs: // GetTTLForService Find the TTL for a given service.
  // return ttl, true if found, 0, false otherwise