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/** Abstracts work that needs to be performed on `DispatchQueue.main`. In case `schedule` methods are called from `DispatchQueue.main`, it will perform action immediately without scheduling. This scheduler is usually used to perform UI work. Main scheduler is a specialization of `SerialDispatchQueueScheduler`. This scheduler is optimized for `observeOn` operator. To ensure observable sequence is subscribed on main thread using `subscribeOn` operator please use `ConcurrentMainScheduler` because it is more optimized for that purpose. */