Because of you made a typo, you're more likely to notice than in a comment or string, because it will fail, even at build time if you're using a compiled language
Right, but the whole point of DO NOT SUBMIT is that it doesn’t need to be in the compilation step. It can be in data files, comments, etc.
You can change your syntax highlighting theme to spot the typos x (I added them with a keyboard shortcut anyways)