In an explanation it might even more clear. There's a directed relationship between "uniqueness" and "mutability": "You're holding a unique reference here, so you're allowed to mutate it". vs "You're holding a mutable reference here, which means it can't be shared".
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This debate happened in 2014, and is known as “the mutapocalypse”
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Oh I didn't realize *that's* what that referred to. Guess it's before my time haha.
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