Re: [whatwg/fetch] Return a "controller" instance from fetch (#1329)

@noamr commented on this pull request.



> @@ -255,6 +258,29 @@ given a <a for=/>fetch timing info</a> <var>timingInfo</var>, return a new
  <var>storedTimingInfo</var>'s <a for="fetch timing info">decoded body size</a>.
 </ol>
 
+<p>To <dfn for="fetch params">abort</dfn> a <a for=/>fetch params</a> <var>fetchParams</var>,
+set <var>fetchParams</var>'s <a for="fetch params">fetch state</a> to "<code>aborted</code>".
+
+<p>To <dfn for="fetch params">terminate</dfn> a <a for=/>fetch params</a> <var>fetchParams</var>,
+set <var>fetchParams</var>'s <a for="fetch params">fetch state</a> to "<code>terminated</code>".
+
+<p>A <a for=/>fetch params</a> <var>fetchParams</var> is <dfn for="fetch params">canceled</dfn> if
+its <a for="fetch params">fetch state</a> is "<code>aborted</code>" or "<code>terminated</code>".
+
+<p>A <dfn export>fetch controller</dfn> is an object used to enable clients of an ongoing fetch
+to perform certain actions in the context of that fetch instance.

The reason for going down this route is to enable external callers to "finalize", "terminate" or "abort" a fetch using an actual construct rather than prose like "the ongoing fetch", or having to return "too much information" in the form of `fetch params`. 



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