Lots of mutators over a single piece of data gets you data races. If you do it correctly, you protect against this somehow, using something like a mutex, or som

Lots of mutators over a single piece of data gets you data races. If you do it correctly, you protect against this somehow, using something like a mutex, or something more complex. Rust provides RefCells, Mutexes, and fancy libraries like Crossbeam for exactly this reason.