Yes Virginia, it's a 13-fit. Obviously 6 is cold, but how would you get there? I would have definitely made a "strong" jump-shift regardless; probably would have heard a raise, 4 cards substituting an honor, then serious 3NT. The end I'm not sure...
1♣-2♠-
3♠-3NT-
4♣-4♦-
4♥-4NT-
5♥-5NT-
6♥-6♠?
Brief history: today I was on BBO, and three of us were just about to leave, when I picked up the East hand. And it was too late to hold partner back for just one more.