cjohansen/Sinon.JS — pull request #162 by opichals (2012-07-16 14:42:46+00:00)
Title: Avoid readystatechange -> DONE on abort() when already in DONE state.

This was failing when used with YUI 3.5.0 Y.IO transport where the success callback was issued twice as YUI issues a call to abort() as a part of its IE7/8 request cleanup.