Re: [streams] Support reading bytes into buffers allocated by user code on platforms where only async read is available (#253)

Sorry, I forgot that Mozilla has already implemented it https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/transfer. Never mind.

JSC also has JSC::ArrayBuffer::transfer. I imagine it corresponds to the function we are talking about.

Then it seems good to define an abstract operation and use it.

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