Re: [whatwg/fetch] WIP: Cancelation (#523)

annevk commented on this pull request.



> +<pre class=idl>
+[Exposed=(Window,Worker)]
+interface FetchSignal : CancelationSignal {
+  // Nothing additional exposed here yet
+};
+</pre>
+
+<h3 id=fetch-controller>Fetch controller</h3>
+
+<pre class=idl>
+[Constructor(), Exposed=(Window,Worker)]
+interface FetchController : CancelationController {
+  [SameObject] readonly attribute FetchSignal signal;
+  // Nothing additional exposed here yet
+};
+</pre>

Well, if you pass in the superclass or a differently subclass, presumably we'd reflect that instance directly on the constructed `Request` object and not some copy. And therefore that would have to specify the superclass.

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