Inheritance in Actors

[PMUNOZ08]

There is an exception relative to inheritance in Actors. An actor can inherit from NSObject for compatibility with code base, mainly for interoperability with Objective -C.
Same root cause as for final clases can inherit from NSOBject and be marked as sendable.

[AvdLee]

That's a great catch, thanks a lot @PMUNOZ08! I've updated the lesson Understanding actors in Swift Concurrency to mention this.