Re: [whatwg/streams] Review request on the ReadableStream API (#433)

@GrumpyMcGrumperson 

> Why isn't a byte stream the lowest level building block here?

A byte stream is a stream that's optimised for chunks of `Uint8Arrays`, whereas general streams can be of any value (objects, numbers, dates, whatever).

> In fact, isn't a "pull source" a Stream too? Pushing and Pulling are just different ways of arranging for stuff to come out of a Stream!

Right! That's why they aren't different types here. See the examples https://streams.spec.whatwg.org/#creating-examples

> I also noticed people talking about reading stuff from a stream, and it looked like you should have just copied what Java does

What's bad about the current spec that Java does better?

> This reminds me, why would a GzipStream be a "TransformerStream", with both a Readable- and a WriteableStream? Why would it be necessary?

By having a writable endpoint it can be piped to. Because its a separate property it can be passed to other pieces of code without exposing the whole transform object.

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