I have decided. In the same way that `arr[0]` is the first entry in the array, the "first floor" of a building should mean floor 0 (at ground level) Also floor -1 is the top floor
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Lua, Julia, and a few other programming languages go against the norm by having arrays start at 1 instead of 0. I hereby therefore declare that arrays starting at -10 are a perfectly valid choice, and thus arrays *can* have basements.
