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

domenic commented on this pull request.



> +
+    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|.
+    1.  For each [=exposed=] [=regular attribute=] |attr| that is an [=interface member=] of |I|:
+        1.  Let |id| be |attr|’s [=identifier=] [=converted to an ECMAScript value=].
+        1.  Let |value| be [=?=] [=Get=](|O|, |id|).

I haven't had time yet to review this PR (hopefully today), but the two proposed phrasings are identical. If I understand the context correctly, I think you want something like "Let _value_ be the result of running the steps specified for the getter of the IDL attribute _id_ on object _O_". But please read that skeptically as I am jumping into the middle here without much context.

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