Re: [heycam/webidl] Specify open dictionaries. (#180)

domenic commented on this pull request.



> +IDL {{OpenDictionary}}<|K|, |V|> values are represented by
+ECMAScript <emu-val>Object</emu-val> values.
+
+<p id="es-to-open-dictionary">
+    An ECMAScript value |O| is [=converted to an IDL value|converted=] to an IDL <code>{{OpenDictionary}}<|K|, |V|></code> value as follows:
+</p>
+
+<ol class="algorithm">
+    1.  Let |result| be a new empty instance of <code>{{OpenDictionary}}<|K|, |V|></code>.
+    1.  If [=Type=](|O|) is <emu-val>Undefined</emu-val> or <emu-val>Null</emu-val>,
+        return |result|.
+    1.  If [=Type=](|O|) is not <emu-val>Object</emu-val>,
+        <a lt="es throw">throw a <emu-val>TypeError</emu-val></a>.
+    1.  Let |keys| be [=?=] [=EnumerableOwnProperties=](|O|, "key").
+    1.  Repeat, for each element |key| of |keys| in [=List=] order:
+        1.  If [=!=] [=HasOwnProperty=](|O|, |key|) is <code>true</code>, then:

Fair enough. @annevk, @bzbarsky, what do you think of my suggestion? I'm not sure why we do what we do in StrucuredClone, and I suspect legacy constraints.

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