Oddbean new post about login | logout Rounding is banned?
Yes. Especially when it comes to geometric shapes. Congruence must be down to the farthest decimal.
In this realm, zero width lines don't exist. All lines are at least the width of a Planck Length, all points have a minimum volume of the Planck Volume, etc. Practically, lines are typically much wider than these theoretical minimums, which makes finding a true straight line or right angle in nature a rarity.