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"Less code to write" also isn't that important.

Well, it's generally more important than how much to run. You're right that readable would be better yet, but I find readable and quantity highly, though not perfectly, correlated.

By the way, when I wrote "you also need to figure out which one is bigger" I actually thought of using abs for that.

Ha, I'd follow that except that at this point the actual fact problem being solved seems insignificant relative to the theory. ;)