Revert Buf::as_str safety change from PR 2319 #2329
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serde::de::format::Buf is a private type, so this makes it explicit by declaring the type `pub(super)`. In addition, it marks the function `Buf::as_str` as unsafe, which lets us document the callsites with `// Safety: ...` comments to explain why it is safe to use.
This changes a comment to be explicit on how it's safe we can avoid validating UTF-8.
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Per #2319 (review), the API enforces that the caller only wrote UTF-8 into the buffer.
This PR includes the 2 commits from #2319.