This is based on the discussion can.l and I am having in appdev.
It's mostly about information hiding. Strictly speaking, you can always access
everything if you know the right levers to pull.
It's just what is enough of a signal to make the user understand they're doing
weird shit.
Using private object fields that require usage of std/Importutils is one way.
Using a distinct type is another. Just a matter of if distinct type casting is
"strong enough" of a marker.