This content was released on Oct 6 2020. The official support period is 6-months from this date.
Any Cancellable (which the sink method returns) is a type-erased, Hashable class that you'll be using a lot with Combine.
This is a companion discussion topic for the original entry at https://www.kodeco.com/10877489-combine-in-the-raywenderlich-com-app/lessons/3