Re: [whatwg/webidl] Seeking clarification on whether unioning promises and callbacks is allowed (Issue #1278)

Promises are [indistinguishable](https://webidl.spec.whatwg.org/#example-distinguishability-promises) and thus cannot be members of unions. This follows from the fact that e.g. `3` is a valid ECMAScript input for `Promise<byte>` — it’s like `await 3` or `Promise.resolve(3)`.

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