anchor.diff:      rpcAddress = mkOption {
         type = types.nullOr types.str;
         default = "127.0.0.1";
  -      example = literalExample "null";
  +      example = null;
         description = ''
           The address or interface to bind the native transport server to.
   
  
positive.code:     listenAddress = mkOption {
        type = types.nullOr types.str;
        default = "127.0.0.1";
        example = literalExample "null";
        description = ''
          Address or interface to bind to and tell other Cassandra nodes
          to connect to. You _must_ change this if you want multiple
  
negative.code:     incrementalRepairInterval = mkOption {
        type = types.nullOr types.str;
        default = "3d";
        example = null;
        description = ''
          Set the interval how often incremental repairs are run, i.e.
          <literal>nodetool repair</literal> is executed. See
  