[whatwg/streams] Reading last chunk from StreamReader (#760)

If a StreamReader knows that any given chunk is the last chunk in the stream, is it acceptable for the StreamReader to resolve the read Promise with `{ value: lastChunk, done: true }`? The specified default reader implementation does not seem to do that and I was wondering if there's any specific reason for that?

https://streams.spec.whatwg.org/#default-reader-read

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