As it turns out, I am writing my own language, and my language supports grapheme cluster segmentation. I just used libunistring (and before that, I used ICU). T

As it turns out, I am writing my own language, and my language supports grapheme cluster segmentation. I just used libunistring (and before that, I used ICU). TFA is not doing this correctly at all; the Unicode specification provides the rules for grapheme cluster segmentation if you wish to implement it yourself[0]. There's nothing to be learned from TFA's hacky and fundamentally incorrect approach. OP's technique will freely chop combining code points that needed to be kept. [0] https://unicode.org/reports/tr29/ https://unicode.org/reports/tr29/