walnut- plane first then size or what?

[Sparktrician]

I'm in the camp that planes both sides, but well oversized, then rack the planed pieces for a week or two in a conditioned space to let them adjust to having been planed and letting out the stresses.  Only then comes the final planing to size and jointing/ripping.  I've had too many boards that "self-adjusted" after having been planed to size which necessitated a restart with more lumber.  YMMV...