Always worth read: How to write unmaintainable code

Masking

Writing the roman numeral IIII instead of IV is not uncommon on clocks: https://www.deutsches-uhrenmuseum.de/en/museum/knowledge/clock-facts/clock-dials-with-4-iiii-or-iv.html

Nothing a Wi-Fi controlled power outlet can’t fix. If the printer is turned off it can’t suddenly start printing.