> For instance, ZERO WIDTH SPACE (U+200B) isn't a whitespace character at all. Despite the name, it's a format character that can indicate a word or line break opportunity without adding a visible gap.

that's what happens when you throw a lot of garbage in, mix it up and forget to clean (piece of trivia - this was a space char many years ago; another one - the Braille whitespace char is unitechnically not whitespace)

> So even the assumption that whitespace must look empty isn't always true.

indeed, another obvious fail of this classification ("naming is hard")

> not frozen in time, and is constantly evolving

unfortunatly the evolution is freezing, so such issues remain unfixed. Here is a few emojis as a consolation prize instead!