University of Cambridge discovered a unicode exploit that allows you to rearrange the order in which characters are displayed using nothing but unicode so what you see isn’t the order in which the characters are interpretted by shell, a compiler, daemon, ect.
RedHat made a diagnostic script to see if your code contains the BiDi characters which enable this exploit:
Credit to: https://podcast.asknoahshow.com/257 for the heads up
Now, that is pretty sneaky. Good find !!!