Re: [whatwg/streams] Support teeing readable byte streams (#1114)

@MattiasBuelens commented on this pull request.



> +     1. If |otherCanceled| is false and
+        |otherBranch|.[=ReadableStream/[[controller]]=].[=ReadableByteStreamController/[[pendingPullIntos]]=]
+        is not [=list/is empty|empty=], perform !
+        [$ReadableByteStreamControllerRespond$](|otherBranch|.[=ReadableStream/[[controller]]=], 0).
+    1. If |byobCanceled| is false or |otherCanceled| is false, [=resolve=] |cancelPromise| with undefined.
+
+   : [=read-into request/error steps=]
+   ::
+    1. Set |reading| to false.
+  1. Perform ! [$ReadableStreamBYOBReaderRead$](|reader|, |view|, |readIntoRequest|).
+ 1. Let |pull1Algorithm| be the following steps:
+  1. If |reading| is true, return [=a promise resolved with=] undefined.
+  1. Set |reading| to true.
+  1. Let |byobRequest| be ! [$ReadableByteStreamControllerGetBYOBRequest$](|branch1|.[=ReadableStream/[[controller]]=]).
+  1. If |byobRequest| is null,
+   1. Perform |pullWithDefaultReader|.

Right, [he did](https://github.com/whatwg/streams/pull/1114#discussion_r645566297), but I only fixed one instance. I'll go through the whole thing again.

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