Your own. Everyone else's is trash. Never understand someone else's code-- the whole point is that there should be just a handful of functions of yours I can call, and shouldn't ever care to see how the sausage is made. Otherwise, your abstraction sucks
I agree that the internals of my code should be abstracted away from my users. But don't I still want the internals to be well designed so they are maintainable and extendable?