anchor.diff:      labels: ['severe: performance'],
     );
   
  -  var closedPerfIssues = await github.search(
  +  var closedPerfIssues = await github.fetch(
       owner: 'flutter',
       name: 'flutter',
       type: GitHubIssueType.issue,
  
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['include-performance'] ?? false;
    Options(List<String> args) {
      _parser
        ..addFlag('help',
  
negative.code:           defaultsTo: DateTime.now().toIso8601String(),
            abbr: 't',
            help: 'to date, ISO format yyyy-mm-dd')
        ..addOption('exclude-performance',
            abbr: 'e', help: 'include performance issues');
      try {
        _results = _parser.parse(args);
        if (_results['help']) _printUsage();
  