[1] Align upload event dispatch with implementations (annevk著, ) <https://github.com/whatwg/xhr/commit/667d4f3604aaee4e24bde33ed487cf8a98274e70>
[2] Use [SameObject] for XMLHttpRequestUpload (annevk著, ) <https://github.com/whatwg/xhr/commit/30ebde608a3be6109ca8f9092a4f0ad887089dee>
[3] Editorial: add note about event listeners causing preflight (sideshowbarker著, ) <https://github.com/whatwg/xhr/commit/b1fd4d2d85be818adeb38a283e33b23a7152c170>