I guess now we finally know why Babbage never finished building the Analytical Engine.
I always assumed they were asking if it was rigged.
Like, i can write function sum(a, b) that always returns 10, and impress people how it's correct when I pass in 1,9 and 2,8 and 3,7. But if I pass in 7,7 it'll still return the "right" answer of 10, because it's rigged and not actually doing math.