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Rollup merge of rust-lang#61969 - MikailBag:master, r=Centril
Add #[repr(transparent)] for several types In some functions, types mentioned in this PR are transmuted into their inner value. Example for `PathBuf`: https://github.com/rust-lang/rust/blob/master/src/libstd/path.rs#L1132. This PR adds `#[repr(transparent)]` to those types, so their correct behavior doesn't depend on compiler details. (As far as I understand, currently that line, converting `PathBuf` to `Vec<u8>`, is UB).
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