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An unsoundness issue in TCell and TLCell was discovered and fixed by GitHub user steffahn. This is due to Rust TypeId taking into account the lifetime, i.e. you get a different type-id for the same type with different lifetimes, and Rust will automatically cast between them. The solution is to force invariance with some type voodoo. This is a weird corner of Rust I'd never understood before. Ideally std::any::TypeId docs should be improved. (This bug does not affect the safety of correct use of the crate, but fixing it blocks a malicious coder from getting potential unsoundness through a code review.)
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You might want to open a security advisory for that unsoundness issue. The database has a dedicated advisory type for unsoundness issues, see e.g. RUSTSEC-2019-0036
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