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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This mixed hybrid of the UK and US systems of building floor naming is certain to create no ambiguity or confusion at all
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The C standard explains that it is not undefined behaviour to stand on the roof
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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.
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Look up Perl's built-in variable, `$[` https://perldoc.perl.org/perlvar.html
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I thought it wraps around so that in a three-story overground building, top floor is -1, second-highest -2, ground is -3, and thus basements count down from there
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The penthouse is the basement, therefore all buildings are toruses.
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