Re: Nulls, integrity, the closed world assumption and events

I may have screwed up your pizza order. Did you mean these?

(; Get cheeses on pizzas with peperoni topping)
(; Gets mozzarella, provolone, mozzarella)
(get (& (get pizza instance *)

           (get * topping peperoni))
       cheese *)

(; Get cheeses on first pizza with peperoni topping)
(; Gets mozzarella, provolone)
(get (filterFirst (& (get pizza instance *)

                         (get * topping peperoni)))
       cheese *)