Re: [streams] Transform streams and acknowledgement of writes (#329)

> It's a bit surprising how BYOB becomes a footgun.

Yeah, both two writers above provide buffers, so they don't work well with BYOB which provides its buffer for reading. If there is a writer that takes a function which will be called with a buffer provided via BYOB reader, it will work well with BYOB reader (But I think it is a bad idea).

Stating the reading way in the spec may be beneficial ("The fetch operation will read from the given stream with a `with-ack` reader" for example).

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