Re: [heycam/webidl] Update attribute setter/getters in various ways (#217)

domenic commented on this pull request.



> +                    then:
+                    1.  If |attribute| was specified with the [{{LenientThis}}]
+                        [=extended attribute=], then return <emu-val>undefined</emu-val>.
+                    1. Otherwise, <a lt="es throw">throw a <emu-val>TypeError</emu-val></a>.
+            1.  Let |R| be the result of performing the actions listed in the
+                description of |attribute| that occur on getting (or those listed in the description
+                of the inherited attribute, if this attribute is declared to
+                [=inherit its getter=]), on |O| if |O| is not <emu-val>null</emu-val>.
+            1.  Return the result of [=converted to an ECMAScript value|converting=] |R| to an
+                ECMAScript value of the type |attribute| is declared as.
+
+        And then, if an exception was thrown:
+
+        1.  If |attribute|'s type is a [=promise type=], then:
+            1.  Let |reject| be the initial value of [=%Promise%=].reject.
+            1.  Return the result of calling |reject| with [=%Promise%=] as the

Fixed [SameObject] to reflect this.

In practice UAs are waiting for us to make a decision here; they throw the error per the current spec but are uncomfortable with doing so.

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