Opinion about "time": "2019-01-31T13:36:18+0000"

Thinking about consuming, storing, and deduping this data: I don't think `time` is relevant. The ETag, last modified date, or SRI of the test subject, the test engine, and the client characteristics (e.g., preferred language, OS, high-contrast mode, etc.) is something hashable and repeatable. Date/time data will only make it harder to dedupe and should be stored as metadata with the record but not part of the test itself.