Added UTF-8's multi-byte support to a text editor today, I've always been scared to get into it, it looked messy and confusing at a distance. But the design makes it pretty accessible, for even such a small system as uxn.

The rule is pretty simple:

- starting bytes are 11xx xxxx
- continuation bytes are 10xx xxxx

The entire implementation to handle multi-byte characters is a mere 30ish bytes long.

https://wiki.xxiivv.com/site/utf8.html

example implementation: https://git.sr.ht/~rabbits/left/tree/main/item/src/left.tal#L909