anchor.diff:            type = with types; nullOr port;
             default = 40772;
             description = ''
  -            Port to listen on. If null, it won't listen on any port.
  +            Port to listen on. If <literal>null</literal>, it won't listen on
  +            any port.
             '';
           };
   
  
positive.code:           default = false;
            description = ''
              Open ports in the firewall for Mirakurun.
            '';
          };
  
  
negative.code: 
        services.mirakurun.serverSettings = {
          logLevel = mkDefault 2;
          path = mkIf (cfg.unixSocket != null) cfg.unixSocket;
          port = mkIf (cfg.port != null) cfg.port;
        };
  
        systemd.tmpfiles.rules = [
  