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Swift 5 updates have been slowly building up to the release of Swift 6. Some of the major updates have been the addition of async/await (concurrency)and existentials.

When you start learning about actors in Swift, you’ll find that explanations will always contain something along the lines of “Actors protect shared mutable state by making sure the actor only does one thing at a time”. As a single sentence summary of actors, this is great but it misses an important nuance. While it’s true that actors do only one thing at a time, they don’t always execute function calls atomically.