What's the difference between Task { } and Task.detached { }?

Middle PRO

The essence

Both create an unstructured task: it is not a child, the parent does not wait for it, and the parent's cancellation does not reach it. The difference is what gets inherited from the creation context.

• Task { } inherits priority, task-local values and the actor isolation of the context: created inside a @MainActor method, it runs on main. In Swift 6 an instance actor's isolation is inherited when the closure captures that actor's self (the @_inheritActorContext attribute).
• Task.detached { } inherits nothing: no priority (it is .unspecified unless given), no task-locals, no isolation — the body is nonisolated and runs on the cooperative pool.