In a photo grid, several cells request the same photo URL at the same time, but the network download must happen only once. How would you keep in-flight Tasks inside an actor to merge the requests?
Keep a [URL: Task<UIImage, Error>] dictionary keyed by URL inside the actor; when a request comes in, if a Task for that URL already exists, await its value, and if not, create a new Task, put it in the dictionary first, then await it. The second cell doesn't start a download and shares the first Task's result.
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