a) It's about half of what I'd write for my own, where I would make sure to test all edge cases (e.g. input string being longer than padding length) as well as

a) It's about half of what I'd write for my own, where I would make sure to test all edge cases (e.g. input string being longer than padding length) as well as Unicode characters. Writing expectations is cheap, fixing bugs later isn't. b) I agree, but you were the one offering "well-testedness" as an argument :)