Stuff gets really nasty when you start trying to reason about case insensitive string comparisons. For example, the following might return something different d

Stuff gets really nasty when you start trying to reason about case insensitive string comparisons. For example, the following might return something different depending on what your locale is: "π".localeCompare("Π", undefined, { sensitivity: "accent" }) My machine says these are equal, but I've seen cases where network stacks consider domains as different if they feature the same Greek letter in a different case even though domain names are supposed to be case-insensitive.