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

@MattiasBuelens commented on this pull request.



> +  1. Return [=a promise resolved with=] undefined.
+ 1. Let |pull2Algorithm| be the following steps:
+  1. If |reading| is true, return [=a promise resolved with=] undefined.
+  1. Set |reading| to true.
+  1. Let |byobRequest| be ! [$ReadableByteStreamControllerGetBYOBRequest$](|branch2|.[=ReadableStream/[[controller]]=]).
+  1. If |byobRequest| is null,
+   1. Perform |pullWithDefaultReader|.
+  1. Otherwise,
+   1. Perform |pullWithBYOBReader|, given |byobRequest|.[=ReadableStreamBYOBRequest/[[view]]=] and true.
+  1. Return [=a promise resolved with=] undefined.
+ 1. Let |cancel1Algorithm| be the following steps, taking a |reason| argument:
+  1. Set |canceled1| to true.
+  1. Set |reason1| to |reason|.
+  1. If |reading| is false and
+     |branch1|.[=ReadableStream/[[controller]]=].[=ReadableByteStreamController/[[pendingPullIntos]]=]
+     is not [=list/is empty|empty=],

Solved in #1129.

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