Re: [w3c/ServiceWorker] Declarative routing (#1373)

> This is pretty easy to do in TypeScript, but I don't think it's possible in WebIDL (@domenic, am I correct here?).

Right, you'd need to add a bit of prose. The type would be `sequence<EnumType, OptionsDictionaryType>` and then you'd use prose to validate that the sequence is length 2, and each index is as expected.

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