any difference between MainActor.run { } and Task { @MaintActor in }

The difference between MainActor.run { } and Task { @MainActor in } lies in how they handle the execution context and task creation:

MainActor.run { }:
- This does not start a new task. Instead, it tells Swift that the code inside the closure is already running on the main actor.
- It is used to assert that the current execution context is already on the main actor, and it will trap (i.e., cause a runtime error) if this is not the case.
- This is useful when you want to ensure that certain code is running on the main actor without creating a new asynchronous task.
For example:
```
MainActor.run {
    // Code here is assumed to be running on the main actor
}
```
Task { @MainActor in }:
- This starts a new asynchronous task that is explicitly isolated to the main actor.
- It is used when you need to perform some work on the main actor but are currently in a different concurrency context.
- This ensures that the code inside the task runs on the main actor, even if the task is created from a different actor or thread.
For example:
```
Task { @MainActor in
    // Code here runs on the main actor in a new task
}
```

In summary, MainActor.run { } is for asserting that the current code is already on the main actor without creating a new task, while Task { @MainActor in } creates a new task that runs on the main actor.

For more details, you can refer to the session Migrate your app to Swift 6 (24:15).