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Compare language-level isolation with traditional queue-based synchronization in production iOS code
Explain that deinit runs where the last strong reference is released, then connect that rule to UI safety, MainActor isolation, and isolated deinit
Define retain cycles in ARC terms, show the most common ways teams create them, and explain how to prevent and debug them in production code
Explain when fixed child tasks make `async let` the better tool, and when dynamic fan-out or incremental result handling pushes you to task groups