Imagine, if you will. A world where string reverse changes the character codes of the string.
What beauty, what wonder would such a world have?
Destruction and despair. Developers unsure why their programs donโt respond correctly. Ships run aground on islands already overcrowded with those who were shipwrecked before. Signal antennas pointed towards the sun with itโs constant noise. Spacecraft whose exhaust melt to slag populated cities as people briefly scream their final terrors of pain and suffering.
This, is a world we should not want to live in. A world you can only find, in the Twilight Zone.
Nah, this could've been possible with some clever fuckery in defining those emojis' unicode content, like with flags that are not a single point but three independent ones, allowing you to do this:
That's known as a ligature and they're pretty common in many programming-oriented fonts, which usually have stylistic sets with different ligatures for different programming languages that you can optionally enable in your editor's configuration. For example, here's the stylistic sets the Monaspace font offers:
Personally I'm not too fond of ligatures so I never enable any, but many folks do like them.
Edit: and just as a side note, ligatures are super common in many fonts, you just might not notice them. Here's some classic examples from the DejaVu Serif font, with and without a ligature: