It’s not just macOS, Windows has the same, with all the same associated problems. For that reason, I generally prefer to keep all file names consistently lower

It’s not just macOS, Windows has the same, with all the same associated problems. For that reason, I generally prefer to keep all file names consistently lower-case - user_account.ex over UserAccount.ex. It’s just as easy to read, if not more so. We have enough other things to worry about as programmers without having to think about correct capitalisation of file names.