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Re:JavaScript Promises: There and back again by danabramov on Tuesday December 17, 2013 @05:58PM (#6924598)
IIRC Angular's promises are based on stripped down version of Kris Kowal's Q. You may want to check it out:

https://github.com/kriskowal/q

Re:JavaScript Promises: There and back again by jeremya on Wednesday December 18, 2013 @09:41AM (#6927695)
As of AngularJS version 1.2, the promises provider ($q) is fully Promises/A+ compliant.

http://blog.angularjs.org/2013/11/angularjs-120-timely-deliv...