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<littledan>
The AsyncContext proposal is considering its semantics for integration with the web platform. A draft is out for review at https://github.com/tc39/proposal-async-context/pull/100 . We'd really appreciate any input that you have. The tl;dr is, WebIDL would bind all (or most?) callbacks passed in to the AsyncContext snapshot which was active when the API is called ("registration time semantics").