Re: [touch-events] TouchEvent constructor is very unusual since it converts one type of object (sequence) to another type (TouchList) (#54)

Hmm, [`ServiceWorkerMessageEvent`](https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#serviceworkermessage-event-interface) is another interesting example.  It takes a `sequence` on input and uses an array type on output.  Presumably there's some story about [WebIDL array types](http://www.w3.org/TR/WebIDL/#idl-array) being replaced by [`FrozenArray<T>`](https://heycam.github.io/webidl/#idl-frozen-array)?

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