"Doubles" really only makes sense for a roll of 2 dice, but it is possible for a player to roll more than 2 dice (by potions from Dr. Jekyll or roller skates if proposal #46 passes). And Mr. Hyde always rolls 3 dice. What exactly counts as doubles? My first inclination would be:
Doubles is when 2 dice in the roll have the same value, and those dice are not part of a larger group of dice in that roll that have the same value
so 5-5-2 would be doubles, but 5-5-5 would not. But that's just my guess, it depends on what Jeff's definition of doubles is. I'm sure the proposal will work anyway, but it couldn't hurt to resubmit the proposal with a definition of doubles for multiple dice. Feel free to copy and paste my definition of doubles above into your proposal if you like (unless someone disagrees with my wording).