Re: [whatwg/streams] ReadableStream.prototype.arrayBuffer() (#1019)

I would guess that something like `Uint8Array.fromAsync` would be unlikely to be optimized well: that is, it would probably end actually allocating and reifying each chunk of bytes as a JS object. It's possible to optimize that away under some circumstances, but it would require special cases for each producer/consumer pair, and there's a lot of fiddly details which would need to get implemented. Whereas something like `ReadableStream.prototype.bytes()` could trivially avoid those intermediate allocations.

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