Spec: https://w3c.github.io/FileAPI/#ref-for-dom-blob-bytes

https://github.com/rustwasm/wasm-bindgen/blob/c35cc9369d5e0dc418986f7811a0dd702fb33ef9/crates/web-sys/webidls/enabled/Blob.webidl#L32-L36

This would be nice to have, as it allows directly going from Blob to Uint8Array, skipping the ArrayBuffer step.

If it's just a matter of updating the Web IDL and nobody has anything against it, I'd be down to open a PR!