anchor.diff:  
           uuid = mkOption {
             example = "eacb6bab-f444-4ebf-a06a-3f72d7465e42";
  +          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 = 30638;
            description = ''
              Specifies the listen port for the HTTP service that returns the
              status page.
            '';
          };
          syncMode = mkOption {
            default = "FSYNC";
            example = "FDATASYNC";
            description = ''
  
negative.code:         };
          syncMode = mkOption {
            default = "FSYNC";
            type = types.enum [ "ASYNC" "SYNC_WRITE_METADATA" "SYNC_WRITE" "FDATASYNC" "ASYNC" ];
            example = "FDATASYNC";
            description = ''
              The sync mode influences how operations are committed to the disk
  