#AskFedi: does anyone have a good article that explains *in depth* what Cell and RefCell are for in #Rust? So not just "this is what they do" or "this is how they work", but more questions like "why does this exist", "why would you need this", "what other approaches could have been taken and why was this one better".

(Do not send me ad-hoc explanations please; an explanation that fits into a toot is almost certainly not going to be in-depth enough here. I'm looking for articles that were written with deliberation and review.)