[heycam/webidl] Should promise-returning attributes reject in case of wrong this value? (#186)

When a promise-returning attribute getter is called on a wrong this value, it is expected to throw a type error. Promise-returning operations on the other side will return a rejected promise.

I am wondering why attribute getters are not also rejecting.
Although not WebIDL based, https://streams.spec.whatwg.org/#default-reader-closed is doing so for instance.


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