Re: [whatwg/webidl] Defining AbstractModuleSource interface type (Issue #1322)

Good points. We probably should support both `%AbstractModuleSource%` and `%AbstractModuleSource.prototype%` chains here yes.

Perhaps that would mean two new attributes then?

```
[Exposed=*, Serializable, InstrinsicParent="%Error%", IntrinsicPrototypeParent="%Error.prototype%"]
interface DOMException { /*...*/ };

[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet), IntrinsicParent="%AbstractModuleSource%", IntrinsicPrototypeParent="%AbstractModuleSource.prototype%"]
interface Module { /*...*/ };
```

It's quite a lot of machinery for a single case though that only possible simplifies DOMException. Have there been other cases of this sort of thing?

While DOMException is an exception, we do have a similar thing for `namespaces` in the console spec at https://console.spec.whatwg.org/#console-namespace where it overrides the default prototype from the https://webidl.spec.whatwg.org/#namespace-object steps effectively with a comment. Perhaps we could use a similar approach.

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