what is the ui layer going to do when you have both hello.txt and HELLO.TXT? if case-insensitivity is to be done at all, it has to be enforced at the file syste

what is the ui layer going to do when you have both hello.txt and HELLO.TXT? if case-insensitivity is to be done at all, it has to be enforced at the file system level that the two names refer to the same file.