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While investigating how best to implement the Kinto side of push notifications, I settled on using ETag as the "current version" to include in push notifications. I was worried about this at first, but @leplatrem pointed out that we support ?_since="quoted Etag". That's interesting, because typically "123" should be a string rather than a number (because we parse values with JSON). But it turns out that not only do we support ?_since="123" (which we probably should, because it matches ETags), but we also support ?_limit="123" (which we probably shouldn't, because there's no string format for limits).