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Description
I'm not sure there's a design doc for this, so I'm filing this with a link to a copy of the original design. If useful, it could be converted to markdown, but this is quicker for now.
This doc should be world readable with the link.
https://docs.google.com/document/d/1yqTJdpXP_ytGR9AZTbJWZifrFJASPxFuQUbBgNf6kyE/edit#heading=h.ila4xrvnurus