Re: [whatwg/streams] do chunk boundaries have to be preserved through to underlying sink? (#739)

To a generic stream, chunks are opaque. ReadableStream has a type: 'bytes' option which causes chunks to be interpreted as sequences of bytes. WritableStream does not have a byte option yet, but it is planned: https://github.com/whatwg/streams/issues/495.

Application code can rely on streams not to modify chunks when the 'bytes' option is not set. In particular, a TransformStream may or may not respect chunk boundaries, depending on what semantics are appropriate.


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