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Changes between Initial Version and Version 1 of Ticket #12978, comment 2

initial	v1
1		I agree with gibson042 here. If the first ~~failed promise~~ failed the collection, for example, you wouldn't know when the unfailed animations completed.
	1	I agree with gibson042 here. If the first xxxx stop()ped animation failed the collection, for example, you wouldn't know when the unfailed animations completed.
2	2
3	3	We already provide the tools to solve this. The code stopping the animation isn't some remote external force, so it can easily coordinate a signal with other code in the app. For example, to get a failed promise you could join both the animate promise and a second promise that you `.reject()` in the function where `.stop()` is called. Wrap it all up in your own method to keep it DRY.