anchor.diff:        command.add('--ipv6');
       if (bundlePath != null) {
         command.add('--flutter-assets-dir=$bundlePath');
  +    }
  +    if (strongMode) {
  +      command.add('--strong');
       }
       command.addAll(<String>[
         '--enable-dart-profiling',
  
positive.code:     String bundlePath,
      bool enableObservatory: false,
      bool startPaused: false,
      int observatoryPort,
    }) {
      assert(executable != null); // Please provide the path to the shell in the SKY_SHELL environment variable.
  
negative.code:         packages: PackageMap.globalPackagesPath,
          enableObservatory: enableObservatory,
          startPaused: startPaused,
          bundlePath: bundlePath,
          strongMode: strongMode,
          observatoryPort: explicitObservatoryPort,
        );
        subprocessActive = true;
        finalizers.add(() async {
  