seems like there's a couple of distinct ways to do copy-on-write: Rc::make_mut if you have owned data, and Cow if you have borrowed data, have I got that right?
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looks like my mental definition of a smart pointer was just wrong. Cow definitely doesn't do any memory management but its still a smart pointer. Now im wondering what happens when you do make_mut on an Rc<str>, I'm assuming it wont end up with a String like Cow does.
