Funny thing, same thing has happened to me.
I play with people that takes games seriously and we play very advance games and can easily take a break for calculation and discuss rules. But with this specific issue the majority thought that "none" is not a number, so "I dont have "fewer", I have none".
I guess you could argue that from a enginering point of view, that if for example a variable has NOT been given a value, you cant compare it to another value, but I argued that "you have zero"... eventually I won, everybody thinking "douchebag" for rest of the game.
But most important I agree with GrimJester.
Important thing is almost to keep the game going, have fun and correct it later.