Re: [heycam/webidl] Replace serializers by toJSON and [Default] extended attribute (#323)

bzbarsky commented on this pull request.



> +The [=corresponding default operation=] of the “toJSON” operation is the [=default toJSON operation=].
+
+<div algorithm>
+
+    To invoke the <dfn export>default toJSON operation</dfn> of [=interface=] |I|,
+    run the the following steps:
+
+    1.  Let |O| be the <emu-val>this</emu-val> value.
+    1.  Let |result| be [=!=] [=ObjectCreate=]([=%ObjectPrototype%=]).
+    1.  If there is an [=inherited interface=] of |I|
+        that declares a “toJSON” operation, then
+        1.  Let |super| be the “toJSON” operation  of
+            the closest [=inherited interface=] of |I|
+            that declares a “toJSON” operation.
+        1.  Set |result| to [=?=] [=Call=](|super|, |O|).
+    1.  If Type(|result|) is not Object, return |result|.

I wonder whether this is observably different from invoking the operation steps...  Do we use the |super| from O's relevant global?  Or from the current global of the toJSON operation?  That is, what is the current global while |super|'s steps are being performed?  This may be observable with toJSON operations that return non-primitives...

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