For those that prefer to dive directly into the (in-draft) spec: https://docs.google.com/document/d/1FadCWj-57dvhxsnFM_7X806qyvhR0u3i85607bGHxvg/edit
@stevenroose Nice work. I'm trying to write a spec in bikeshed (for writing specs)...
@stevenroose It sure is, let me find it...