The test size_of_reference indicates that it's important that references are exactly 80 bytes, but that is not true on 32-bit platforms.
See this patch: https://salsa.debian.org/rust-team/debcargo-conf/-/blob/master/src/gix-ref/debian/patches/allow-reference-to-be-smaller-on-32-bit.patch
Should this test be updated to pass on 32-bit?