Re: [w3c/FileAPI] Reslove Blob to an existing ArrayBuffer (#143)

> I understand, I was basically asking if the writing would be done similarly to https://encoding.spec.whatwg.org/#dom-textencoder-encodeinto. So unless you're multi-threaded and use `SharedArrayBuffer`, you cannot observe a partially filled buffer.

Did you mean that I can use `SharedArrayBuffer` together with `encodeInto` via multi-threads, so WASM can work early whiling stilling coping buffer to WASM memory, as a workaround to reduce latency?

But consider if I am reading **a 100MB file which is not of streaming format**, that means unless the whold 100MB content of the file has been ready in WSAM memory, partically ready content doesn't have much value. In that case, `SharedArrayBuffer` + `encodeInto` still doesn't help much.

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