Picklive/Sinon.JS — comment on commit 6f0232553a6ef4d8df1a7ec455a31f4f73972070
File: lib/sinon/util/fake_xml_http_request.js line 115
By cjohansen:

Wouldn't a better and simpler approach be to `return new xhr.workingXhr();` from the `FakeXMLHttpRequest` constructor? This seems slightly brittle, and I imagine it won't work on IE?