anchor.diff:  
         extraPort = mkOption {
           default = "7117";
  +        type = types.str;
           description = "
             Extra port to avoid filtering.
           ";
  
positive.code: 
        serverName = mkOption {
          default = "hades.arpa";
          description = "
            IRCD server name.
          ";
  
negative.code:       extraIPs = mkOption {
          default = [];
          example = ["127.0.0.1"];
          type = types.listOf types.str;
          description = "
            Extra IP's to bind.
          ";
  