I checked out bcrypt implementation in Hare, and I saw "errors::invalid" being used. It was not specified. What if I want to have more errors and in the documentation I want people to know which errors, say, my library may return from specific functions?

C3 had some weird stuff going on at some places, not exactly sure why. In my other thread someone else already went into it in more detail. I hope the developer will fix it. Needs to stay as close to C as possible and build on top of it, only some of the goodies.