Rollup of 3 pull requests#154033

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JonathanBrouwer wants to merge 7 commits intorust-lang:mainfrom

JonathanBrouwer:rollup-PdAHZYf

Commits on Mar 16, 2026

Change `?Sized` to `PointeeSized` in `UnwindSafe` impls for pointers
theemathas
committed

Commits on Mar 17, 2026

doc: clarify allocator invariant
lms0806
committed