[thenewwazoo]

That's been largely my experience of RIIR over years of work in numerous contexts: attempting to encode invariants in the type system results in identifying semantic issues. over and over.

edit to add: and I'm not talking about compilation failures so much as design problems. when the meaning of a value is overloaded, or when there's a "you must do Y after X and never before" and then you can't write equivalent code in all cases, and so on. "but what does this mean?" becomes the question to answer.