Re: [heycam/webidl] Add the ability to construct a callback function (#328)

bzbarsky commented on this pull request.



> +                href="#construct-return"><i>return</i></a>.
+            1.  Append |convertResult|.\[[Value]] to |esArgs|.
+            1.  Set |count| to |i| + 1.
+        1.  Set |i| to |i| + 1.
+    1.  Truncate |esArgs| to have length |count|.
+    1.  Let |callResult| be [=Construct=](|F|, |esArgs|).
+    1.  If |callResult| is an abrupt completion, set |completion| to
+        |callResult| and jump to the step labeled <a href="#construct-return"><i>return</i></a>.
+    1.  Set |completion| to the result of [=converted to an IDL value|converting=]
+        |callResult|.\[[Value]] to an IDL value of the same type as the operation’s
+        return type.
+    1.  <i id="construct-return">Return:</i> at this
+        point |completion| will be set to an ECMAScript completion value.
+        1.  [=Clean up after running a callback=] with |stored settings|.
+        1.  [=Clean up after running script=] with |relevant settings|.
+        1.  Return |completion|.

I think having an explicit equivalence here is fine, fwiw.  We should just do that.

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