https://learn.microsoft.com/en-gb/dotnet/api/system.text.stringbuilderruneenumerator?view=net-11.0&viewFallbackFrom=net-10.0
StringBuilderRuneEnumerator Struct (System.Text) | Microsoft Learn
Learn more about the System.Text.StringBuilderRuneEnumerator in the System.Text namespace.
structsystemtextmicrosoftlearn