Re: [whatwg/streams] Add Explainer for Byte Streams (#1081)

@nidhijaju commented on this pull request.



> +    async pull(controller) {
+      // Even when the consumer is using the default reader, the auto-allocation
+      // feature allocates a buffer and passes it to us via byobRequest.
+      const v = controller.byobRequest.view;
+      v = crypto.getRandomValues(v);
+      controller.byobRequest.respond(v.byteLength);
+    },
+
+    autoAllocateChunkSize: DEFAULT_CHUNK_SIZE
+  });
+}
+```
+
+
+With this in hand, we can create and use BYOB readers for the returned ReadableStream. The adaptation between the
+low-level byte tracking of the underlying byte source shown here, is all taken care of automatically by the streams

Sorry! I just added the missing part in.

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