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It turned out that there were only a few lines of code that required our MSRV to be as high as it was before this commit (1.65.0), and those lines were easy to modify to be compatible with this new MSRV.
Note that this requires introducing defensive code to
FromZeroes::new_box_slice_zeroed
in order to sidestep a bug inLayout::from_size_align
that was present through 1.64.0.