Objective

Since BufferVec was first introduced, bytemuck has added additional traits with fewer restrictions than Pod. Within BufferVec, we only rely on the constraints of bytemuck::cast_slice to a u8 slice, which now only requires T: NoUninit which is a strict superset of Pod types.

Solution

Change out the Pod generic type constraint with NoUninit. Also taking the opportunity to substitute cast_slice with must_cast_slice, which avoids a runtime panic in place of a compile time failure if T cannot be used.

Changelog

Changed: BufferVec now supports working with types containing NoUninit but not Pod members.
Changed: BufferVec will now fail to compile if used with a type that cannot be safely read from. Most notably, this includes ZSTs, which would previously always panic at runtime.