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Relative priority for this notification. Priority is an indication of how much of the user's valuable attention should be consumed by this notification. Low-priority notifications may be hidden from the user in certain situations, while the user might be interrupted for a higher-priority notification. The system will make a determination about how to interpret this priority when presenting the notification. A notification that is at least Notification.PriorityHigh is more likely to be presented as a heads-up notification.