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

> just figured if this could be part of something like [iterator helpers](https://github.com/alkihis/iterator-helper)

As mentioned above, iterator helpers have a `.toArray` method, and async iterator helpers will have the same. The helper will let you do `await stream.values().toArray()`, which is nicer than what you currently do - but getting all the bytes into a single buffer after is still going to be awkward, and even with a helper like [this](https://github.com/jasnell/proposal-zero-copy-arraybuffer-list) you'd still have a choice between either copying every chunk after reading all of them or giving up locality. This use case really wants a more specific "put all the bytes from a readable byte stream into a single buffer" helper.

And iterator helpers are intended as fully general utilities, so they're probably not the right place to have a method specifically for producers which yield chunks of bytes. That's a pretty uncommon thing to do with iterators anyway; the ReadableStream machinery is much better suited to handle such producers efficiently.

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