There are no code point for TURKISH LOWERCASE DOTTED I not for TURKISH UPPERCASE DOTLESS I, which means that the text doesn't carry enough information for round

There are no code point for TURKISH LOWERCASE DOTTED I not for TURKISH UPPERCASE DOTLESS I, which means that the text doesn't carry enough information for roundtrip preservation. I believe this has proven to be a mistake but I'm not an expert. I don't know why it wasn't done.