Wgpu WriteOnly vs bytemuch vs encase

Ref: rend3-hp/rend3/src/util/scatter_copy.rs at 5480169a3dad0092b8b8da18429358177f3a0470 · John-Nagle/rend3-hp · GitHub I'm trying to update rend3-hp (my fork of abandoned rend3) to wgpu 30, from wgpu 24. There were many breaking changes. I'm down from 150 compile errors to only 2. But I'm stuck on those. error[E0308]: mismatched types --> rend3/src/util/scatter_copy.rs:103:65 | 103 | let mapped_slice: &mut [u32] = bytemuck::cast_slice_mut(&mut mapped_range); | ...