Idiomatic way to have per component instance data?

[grigorig]

What's the best or most idiomatic way to have per component instance data? Components are created and destroyed as needed when navigation occurs, but I want to persist some data, for instance for caching, when navigating back and forth.

At the moment I'm using an Rc<RefCell<T>> wrapper to some state struct which is passed to the component as a property, but that seems quite verbose. I don't like the Rc/RefCell wrapper either and I'd like to avoid it if possible.