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It does for multi-codepoint characters (such as the rainbow flag): https://play.rust-lang.org/?version=stable&mode=debug&editio...

Yeah, another commenter mentioned grapheme-clusters, though apparently there's a readily available crate that adds support: https://stackoverflow.com/questions/58770462/how-to-iterate-...

According to this they added it to the standard library at one point but then broke it back out because the lookup tables were too large