anchor.diff:        ..addOption('to',
             defaultsTo: DateTime.now().toIso8601String(),
             abbr: 't',
  -          help: 'to date, ISO format yyyy-mm-dd')
  -      ..addOption('exclude-performance',
  -          abbr: 'e', help: 'include performance issues');
  +          help: 'to date, ISO format yyyy-mm-dd');
       try {
         _results = _parser.parse(args);
         if (_results['help']) _printUsage();
  
positive.code:   DateTime get from => DateTime.parse(_results['from']);
    DateTime get to => DateTime.parse(_results['to']);
    int get exitCode => _results == null ? -1 : _results['help'] ? 0 : null;
    bool get excludePerformance => _results['exclude-performance'] ?? false;
    Options(List<String> args) {
      _parser
        ..addFlag('help',
  
negative.code:       '### ${closedThisPeriod.length} `P0` issue(s) closed between ${fromStamp} and ${toStamp}');
    closedThisPeriod.forEach((issue) =>
        print(issue.summary(boldInteresting: false, linebreakAfter: true)));
  }
  