[Issue] Unhandled Exception: type 'String' is not a subtype of type 'Iterable<dynamic>' on Server Acknowledgement

[theideasaler]

This issue is caused by spreading args inside a List, while args could be non-List value emitted from server.
bug caused by lib/src/socket.dart:314

312:    acks[sid] = (args) {
313:      timer.cancel();
314:      Function.apply(ack, [null, ...args]);
315:    };

sampe client (socket_io_client: ^3.0.0)

socket.emitWithAck("DEMO_EVENT", "Hello World", (data) { /// ERROR OUT });

sample server (nodejs with "socket.io": "^4.8.0")

socket.on("DEMO_EVENT", async (data, callback) => {
  ...
  callback("ANY_DATA_BUT_ARRAY");
  ...
});

proposed fix:

312:    ...
313:      ...
314:      Function.apply(ack, [null, ...(args is List ? args : [args])]);
315:    ...