anchor.diff:    final _packagesWithVersion = <String>{};
     final _publishers = <String>{};
     final _publishersAbandoned = <String>{};
  +  // package name -> versions
  +  final _badVersionInPubspec = <String, Set<String>>{};
     int _packageChecked = 0;
     int _versionChecked = 0;
     late http.Client _httpClient;
  
positive.code:     yield* _checkLikes();
      yield* _checkModeratedPackages();
      yield* _checkAuditLogs();
      _httpClient.close();
    }
  
  
negative.code:       yield 'PackageVersion "${pv.qualifiedVersionKey}" has `created` < 2011.';
      }
  
      if (pv.pubspec!.hasBadVersionFormat) {
        _badVersionInPubspec
            .putIfAbsent(pv.package, () => <String>{})
            .add(pv.version!);
      }
  
      _versionChecked++;
      if (_versionChecked % 5000 == 0) {
  