Re: [whatwg/streams] Allow other specifications to create readable byte streams (#1130)

@domenic commented on this pull request.



> +<div algorithm>
+ To <dfn export for="ReadableStream">enqueue</dfn> the JavaScript value |chunk| into a
+ {{ReadableStream}} |stream|:
+
+ 1. If |stream|.[=ReadableStream/[[controller]]=] [=implements=]
+    {{ReadableStreamDefaultController}},
+  1. Perform ! [$ReadableStreamDefaultControllerEnqueue$](|stream|.[=ReadableStream/[[controller]]=],
+     |chunk|).
+ 1. Otherwise,
+  1. Assert: |stream|.[=ReadableStream/[[controller]]=] [=implements=]
+     {{ReadableByteStreamController}}.
+  1. Assert: |chunk| is an {{ArrayBufferView}}.
+  1. Let |byobRequest| be !
+     [$ReadableByteStreamControllerGetBYOBRequest$](|stream|.[=ReadableStream/[[controller]]=]).
+  1. If |byobRequest| is non-null, and |chunk|.\[[ViewedArrayBuffer]].\[[ArrayBufferData]] is the
+     same [=Data Block=] as |byobRequest|.\[[view]].\[[ViewedArrayBuffer]].\[[ArrayBufferData]],

Oh, dang, you're right. In that case we should probably solve it by, per the above discussion, prohibiting transferring at a spec level (but allowing it an implementation level as long as the implementation does appropriate behind-the-scenes contortions).

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