Thanks! If I was using a better font I might have spotted that myself.
I know what you mean. I recently noticed something I'd written some months ago, thanking someone: "Thank's" --- aaarrgh!
Though, in my case, I blame it on the ubiquity of the "thank's" misspelling corrupting me. I fear it's only a small matter of time before I mix "their" and "there!"
Being able to distinguish between characters that in many fonts look nearly or exactly the same is really important. Adding these three lines (or something similar that shows this stuff) would make the comparison much more useful: