[tialaramex]

> it doesn't even seem like there's a consensus outside of swift's string implementation of what a grapheme even is.

Linguistically it's easy, graphemes are the squiggles people actually draw, as distinct from how a machine encodes them. Of course since people aren't a single individual with just one consistent opinion that does mean there's room for nuance - maybe some people think this is two separate squiggles.