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to_string is auto-implemented from Display so used to be it ran noticeably slower, because that was what it went through. However that has not been the case in several years, as ToString was specialised for str.
Why not, there is this RFC to have c"🦀" to create a &CStr.
Sure, except that that https://github.com/m-ou-se/rfcs/blob/c-str-literal/text/3348-c-str-literal.md explicitly states "the CStr type will have to become a lang item."
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