Check on practice hove [bluebirdjs-cancellation]( http://bluebirdjs.com/docs/api/cancellation.html) works and find out that [promise-executor]( https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise#Parameters).``onCancel`` callback get executed before finally blocks of all affected promises, so potential api for overriding default cancellation delivery mechanism/"rail" (success/failure/cancellation) might exist still however I can not see them in bluebirdjs documentation.
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