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spec: https://review.opendev.org/#/c/687199

There was multiple discussion during the PTG around this. I think at 
the end mdbooth and yawang found a possible solution that they liked 
and sounded OK to me too. Unfortunately the etherpad was not updated 
and my memory is bad enough that I cannot gather what was the exact 
proposal.

yawang: could you please post a short summary here and / or simply 
update the spec with the discussed solution?

Cheers,
gibi