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I've been thinking it'd be simpler to introduce `dyn Trait` via `&dyn Trait` rather than waiting for the smart pointers section and `Box<dyn Trait>`. This PR adds a slide to the Generics section that introduces `&dyn Trait` and compares it to `&impl Trait`, juxtaposing monomorphization and static dispatch against type-erasure and dynamic dispatch. I've then updated the existing trait object slide to call back to the earlier introduction, and call out that using `Box<dyn Trait>` gives you an owned trait object rather than a borrowed one.
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