Sure it does. It causes the renderer to reverse direction, which overwrites the previous characters. It's EXACTLY this effect which allows for invisible malware insertion into code.
Errors in ASCII are not justification for going bananas adding them everywhere.
>> eurt ton > I'm not even going to address that other than to say LOL
You could try. Somehow I managed to trick HN into rendering text right-to-left by never stepping outside of ASCII.
Unicode further botched things up by introducing modes.
And how many official Unicode letter 'a' glyphs are there? Somehow Unicode decided it needed to confuse fonts with characters. They're not even always different fonts, they sometimes are indistinguishable.
I wouldn't be in the least surprised if Unicode added a clockwise spiral rendering mode.
clock
iralw
i !si
ps es