workgroup_size: expected 32-bit signed integer literal error

[jack1232]

Description

The following compute shader code works in WebGPU:

const SIZE = 8;
@compute @workgroup_size(SIZE, SIZE, 1)
fn cs_main(@builtin(workgroup_id) workGroupId : vec3u, @builtin(local_invocation_id) localId: vec3u) {
    let x = localId.x + workGroupId.x * u32(SIZE);
    let y = localId.y + workGroupId.y * u32(SIZE); 
    ...
}  

But wgpu gives error:

@compute @workgroup_size(SIZE, SIZE, 1)
  │                      ^^^^ expected 32-bit signed integer literal

However, from WGSL spec:
workgroup_size: One, two or three parameters.
Each parameter must be a const-expression or an override-expression. All parameters must be the same type, either i32 or u32.

It is clear that workgroup_size can be a const expression. Why wgpu requires it to be a 32-bit signed integer literal?

Platform
Windows 11, RTX 3060

[teoxoy]

Will be fixed by #2309