Experimental R packages for engineering quality

[emilyriederer]

I suspect this is probably out of scope, but I'll document it in case. Recently, I've seen more and more R packages borrowing good ideas from other languages that are focused on engineering quality / safety.

I know one of popular new development on the python side is type hints. Similarly, there is some experimental work in this space such as the typed package.

Another example (although I'm blanking on the name at the moment), is a package that allows for custom error classes which are common in other languages.

My gut reaction is its a bad idea to put something so experimental in the book, but I don't know if there would be a place in an online-only appendix for us to keep track of R packages that mirror the development of more software engineering focused languages?