This patch seems to have gotten some feedback but development has
stalled. It's marked "waiting on author" but I'm not clear exactly
what is expected from the authors here. It seems there isn't really
consensus on the design at the moment. There's been no emails in over
a month.
Fwiw I find the idea of having a separate "aux" table kind of awkward.
It'll seem strange to users not familiar with the history and without
any clear idea why the fields are split.
