alt Hacker Newsit's good to know about surrogate pairs in unicode. It was new to me too when being part of tracking down incomplete unicode flags in the (excellent) phanpy mastodon client.
Author went for Intl.Segmenter too: https://github.com/cheeaun/phanpy/issues/1491
My recollection (that I didn't add to the story): I don't think Intl.Segmenter had great browser support then (2022). Even if it had it still wasn't a quick/obvious fix for our problem with where it was occurring in our stack. But I do remember looking at it then.