Curly Curly: How to pass bare variable arguments to things?

I recently had a question from a colleague, and thanks to the awesome recent work on rlang this is now super straightforward. I thought I’d share a bit about that. I still remember when I had just learnt how to write a function in R, and I wanted to do the thing where you use a function argument that isn’t a string but it just didn’t work. And I didn’t know how to talk about …