anchor.diff:  
           uuid = mkOption {
             example = "eacb6bab-f444-4ebf-a06a-3f72d7465e40";
  +          type = types.str;
             description = ''
               Must be set to a unique identifier, preferably a UUID according to
               RFC 4122. UUIDs can be generated with `uuidgen` command, found in
  
positive.code:         };
          httpPort = mkOption {
            default = 30640;
            description = ''
              Specifies the listen port for the HTTP service that returns the
              status page.
  
negative.code:         };
          port = mkOption {
            default = 32636;
            type = types.port;
            description = ''
              The port to listen on for incoming connections (TCP).
            '';
          };
          address = mkOption {
            example = "127.0.0.1";
            type = types.str;
            default = "";
            description = ''
              If specified, it defines the interface to listen on. If not
  