I probably shouldn't have said newly C++, but my frame of mind was relative to the lifespan of the language. > Rewriting the Rust std lib to use RefCell everyw

I probably shouldn't have said newly C++, but my frame of mind was relative to the lifespan of the language. > Rewriting the Rust std lib to use RefCell everywhere would be possible, but would make it almost entirely useless. Maybe not useless, but certainly worse than it currently is. The point is that you can switch one function to using RefCell (a breaking change, but) totally possible