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This adds a heap acting as a priority queue to keep track of lease exiprations. Previously the whole lease map had to be iterated through each time. The queue allows us to check only those leases which might be expired. When the expiration changes, we add an additional entry. If we check an entry that isn't expired, it means that the lease got extended. If we find a entry in the heap that doesn't have a corresponding entry in the map, we know that the lease has already been expired or revoked.