GPUCompilationMessage Using UTF-16

[MendyBerger]

The WebGPU spec expects GPUCompilationMessage.linePos/offset/length to be in UTF-16 (source). That makes perfect sense for JavaScript where all strings are UTF-16, including the WGSL strings.

In the case of wasm/wasi we don't know what language the user is going to be using, so assuming UTF-16 seems like a bad idea.

webgpu.h and wgpu both just use bytes (i.e. UTF-8 code units) instead. Should we opt for bytes as well?

[MendyBerger]

Worth adding that the wgsl spec itself defines wgsl as UTF-8 :

A WGSL module is Unicode text using the UTF-8 encoding, with no byte order mark (BOM).