Re: [whatwg/streams] Add Reader Type assertions (#1095)

@ricea commented on this pull request.



> @@ -2393,6 +2393,7 @@ the {{ReadableStream}}'s public API.
  id="readable-stream-fulfill-read-into-request">ReadableStreamFulfillReadIntoRequest(|stream|,
  |chunk|, |done|)</dfn> performs the following steps:
 
+ 1. Assert: |stream|.[=ReadableStream/[[reader]]=] [=implements=] {{ReadableStreamBYOBReader}}.

I would prefer `! [$ReadableStreamHasBYOBReader$](|stream|) is true.`

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