Tagging why a feature started or ended

Mappers are currently using a variety of keys to describe why a feature began or ended. Should we standardize on one of these schemes?

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Quite a few of these occurrences of start_date:cause and end_date cause are the result of some imports, so please don’t hesitate to speak up if you think there’s a better way of doing things - those results may reflect less careful thinking than it appears! (not saying it’s not the right answer, just saying, “Please speak up!”).

Personally, I started using *_date:cause just because I was seeing it so often, but I find that *_event makes more sense. The value doesn’t isn’t what caused the date, it’s what caused the start or end. Still, it’s only slightly awkward; if a mass tag refactoring would be impractical, we could paper it over with a more intuitive field name in iD.