think what I've learned this morning is that RefCell is for mutating inside short-lived borrows, whereas I'm attempting to extract long-lived references from something, intertwined with mutating it, which is never going to work
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I'm mostly guessing here because I know they're all interior mutability containers but I never use them so I don't know their interfaces that well. I've also never used unsafe cell. Pretty much only ever use Mutex in the rare cases where I need interior mut
Defaulting to Mutex is probably reasonable unless you have reason to do otherwise (likewise defaulting to Arc over Rc)
