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> Simultaneously, Observable continues to make progress within TC39 to become a first-class construct of the language.

Worth pointing out that the TC discussed observables with the cancellation you describe here and rejected them less than a week ago. Observables did not progress to stage 2. Currently we are bikeshedding design at the es-observable and es-cancel-token repos (under zenparsing) - contributions are welcome.

Hopefully, a compromise everyone is happy about will be reached soon.

You also might want to mention async-iterators which are a stage 2 proposal.







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