ZIO[l, r, e, a]: The 4th Parameter
The almighty ZIO has one mountain left to conquer: one class of workflows is not powerful enough to represent, those that don't leak secrets. But fear not, the trip to the top is not so difficult to make, and as per usual with the effect system that we all know and love, the journey and the destination are both elegant and efficient. The only difficult question really is: will the Karens of the FP world complain yet again at the sight of another parameter? Come and find out!