Re: [whatwg/webidl] Add distinguishable state for cb and dictionary-like (PR #1353)

_This comment only intends to make a design decision implied by this PR explicit to other readers._

The [LTNOAN] annotation causes only _nullable_ types with the annotated callback function as their inner type to have the problematically expanded value space — and more specifically, only when used as an attribute’s type. In every other context, an [LTNOAN]-annotated callback function behaves exactly the same as any other.

This PR will leave all [LTNOAN]-annotated callback functions indistinguishable from dictionary-likes even in contexts where [LTNOAN] is otherwise ignored/meaningless.

That seems like a reasonable call:

- It’s much simpler than trying to account for all those quirky conditions
- It’s usually okay (or even desirable) to leave _legacy_ features in the dust when introducing new features

Again, this comment’s just an “FYI” thing in case other folks _do_ see a problem with this approach — as far as I can tell, it works.


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