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Re:Cancelable Promises: Why was this proposal withdrawn? by detaro on Monday December 19, 2016 @08:50AM (#13211330)
The presentation about the proposal linked in a comment above [0] and the proposal itself [1] explain the difference to an exception quite well

[0] https://docs.google.com/presentation/d/1V4vmC54gJkwAss1nfEt9...

[1] https://github.com/tc39/proposal-cancelable-promises/blob/0e...

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