Automatically Cancelling Continuations

Using Swift
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10

I'm not sure if its possible to add conformances to existing stdlib types - see: Backwards-deployable Conformances but the usability of withTaskCancellationHandler could be much nicer if CheckedContinuation conformed to Identifiable

await withCheckedContinuation {
  continuations[$0.id] = $0
} onCancel: { id in
  Task { await self.cancelContinuation(with: id) }
}