opt.

lib/data/model/sftp/req.dart

@@ -77,19 +77,19 @@ class SftpReqStatus {
   void onNotify(dynamic event) {
     var shouldDispose = false;
     switch (event) {
-      case SftpWorkerStatus val:
+      case final SftpWorkerStatus val:
         status = val;
         if (status == SftpWorkerStatus.finished) {
           dispose();
         }
         break;
-      case double val:
+      case final double val:
         progress = val;
         break;
-      case int val:
+      case final int val:
         size = val;
         break;
-      case Duration d:
+      case final Duration d:
         spentTime = d;
         break;
       default:

lib/data/model/sftp/worker.dart

@@ -56,7 +56,7 @@ Future<void> isolateMessageHandler(
   SendErrorFunction sendError,
 ) async {
   switch (data) {
-    case SftpReq val:
+    case final SftpReq val:
       switch (val.type) {
         case SftpReqType.download:
           await _download(data, mainSendPort, sendError);