Well, pasting the enum example into IntelliJ highlighted the spelling mistakes and suggested replacing NINTEY and NINETEY with NINETY. I think this is how my dyslexic colleague works too - copy pasting instead of writing and looking for various wiggly lines in code editor.
Yeah, spell check in editor is killer, and I work in strongly typed languages so it's a compiler error if I misspell a variable name is another big one.