code: func AllFeatures() *Config {
  	return &Config{
  		RetainedMessages:     true,
  		StoredPackets:        true,
  		StoredSubscriptions:  true,
  		OfflineSubscriptions: true,
  		Authentication:       true,
  		UniqueClientIDs:      true,
  		RootSlashDistinction: true,
  	}
  }
docs: // AllFeatures returns a config that enables all features.