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For example, by explicitly calling shrink_to_fit. So you either have fragmentation, or an extra copy if you're not careful, but none of the solutions let you forget about the detail entirely.

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If you look at the source for into_boxed_slice, it calls shrink_to_fit at the beginning before doing anything else. Hence the documentation is slightly wrong, and no copies occur.

Edit: I submitted a PR to clear up the docs: https://github.com/rust-lang/rust/pull/120110

thank you!

Or alternatively, the vector was created with `Vec::with_capacity()` or `ExactSizeIterator::collect()`, and had the correct capacity all along.

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