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Note that the nomicon source code and website only gets sent to beta once per Rust release, where it spends 6 weeks incubating before it gets released. Personally I think that feeding users stale information (nomicon updates take up to 3 months for users to see, unlike wikis which are instant) is a very bad feedback cycle, and users are better served reading the source repository or nightly nomicon since it often has better information (and I haven't found any cases where the information is incompatible with stable Rust).
Work on precisely specifying the semantics of unsafe is happening in the Unsafe Code Guidelines Working Group: https://github.com/rust-lang/unsafe-code-guidelines . AIUI as they nail down the semantics they gradually bring the Rustonomicon up to date. If you have a question that isn't answered by either the draft guidelines or the nomicon, ask in the Zulip channel: https://rust-lang.zulipchat.com/#narrow/stream/136281-wg-unsafe-code-guidelines