Nightly compatibility release.
As of the 2026-08-14 Rust nightly the unstable allocator_api Allocator
trait no longer provides a by_ref method, so the by_ref overrides on
Alloc64 and MAllocPg64 stopped compiling. Both overrides are removed.
Where code previously called alloc.by_ref(), take a reference to the
allocator with &alloc, which acts as an allocator through the standard
impl Allocator for &A blanket. Removing the methods is a breaking change,
so this is a minor version bump.