I’ve wondered this too. At one point I started writing a hobby programming language and explicitly added escape codes for these extra control characters to be u

I’ve wondered this too. At one point I started writing a hobby programming language and explicitly added escape codes for these extra control characters to be used in string literals. (Ada has them all included in the “ASCII” package which is nice.) It seems like a no-brainer to bake them into file formats like the OP describes.