Is it correct to say that when defining a trait/interface, you must decide whether implementers will use interior mutability? In other words, its use is not merely an implementation detail?

When I first learned about interior mutability, I thought it was an implementation detail. However, as I experiment with it, I see that you need to decide whether the trait methods take &self or &mut self, and whether you pass around dynamic objects as Rc<dyn T> or Rc<RefCell<dyn T>> (or their multithread equivalents).

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