Re: [whatwg/streams] Access to reader.readIntoRequests withtout checking reader type (#686)

Hi @domenic, no problem for the delay. If I understand the spec correctly, below sample leads to calling ReadableByteStreamControllerRespondInClosedState with a default reader.

```javascript
// First create a ReadableStream with a ReadableByteStreamController
// and a specific value for autoAllocateChunkSize.
let controller;
const rs = new ReadableStream({
 autoAllocateChunkSize: 128,
 start: function(c) {
  controller = c;
 },
 type: "bytes"
});

// As autoAllocateChunkSize is defined, calling read() leads to adding
// an item to controller.pendingPullIntos through controller pull() method.
rs.getReader().read();
// Hence, byobRequest can be obtained (step 2 of "get byobRequest").
const br = controller.byobRequest;
controller.close();
// Stream has been closed prior to calling respond() and bytesWritten value
// is 0: therefore, ReadableByteStreamControllerRespondInClosedState is called.
br.respond(0);
```

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