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Using toLowerCase() or toUpperCase() in your conditional logic? That's some big brain energy right there. Most devs just slap these methods on strings for case-insensitive comparisons without a second thought, but the real ones know this is a minefield of locale-specific chaos waiting to explode.
The Turkish İ problem is legendary: in Turkish locale, the uppercase of 'i' is 'İ' (with a dot), not 'I', and lowercase 'I' becomes 'ı' (without a dot). So your innocent if (userInput.toLowerCase() === "admin") suddenly breaks when deployed in Turkey. There's also the German ß that uppercases to "SS", and Greek sigma has different lowercase forms depending on position. Unicode is wild, and these methods respect locale by default in some languages.
Pro tip: use toLocaleUpperCase() or toLocaleLowerCase() when you actually care about proper linguistic handling, or better yet, use case-insensitive comparison methods that don't mutate strings. The lion knows what's up.
