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

@MattiasBuelens commented on this pull request.



> +   1. Set |reader| to ! [$AcquireReadableStreamBYOBReader$](|stream|).
+   1. Perform |forwardReaderError|, given |reader|.
+  1. Let |byobBranch| be |branch2| if |forBranch2| is true, and |branch1| otherwise.
+  1. Let |otherBranch| be |branch2| if |forBranch2| is false, and |branch1| otherwise.
+  1. Let |readIntoRequest| be a [=read-into request=] with the following [=struct/items=]:
+   : [=read-into request/chunk steps=], given |chunk|
+   ::
+    1. [=Queue a microtask=] to perform the following steps:
+     1. Set |reading| to false.
+     1. Let |byobCanceled| be |canceled2| if |forBranch2| is true, and |canceled1| otherwise.
+     1. Let |otherCanceled| be |canceled2| if |forBranch2| is false, and |canceled1| otherwise.
+     1. If |otherCanceled| is false,
+      1. Let |clonedChunk| be ? [$CloneAsUint8Array$](|chunk|).
+      1. Perform ! [$ReadableByteStreamControllerEnqueue$](|otherBranch|.[=ReadableStream/[[controller]]=],
+         |clonedChunk|).
+     1. If |byobCanceled| is false,

I went for the second option.

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