No, let me try to explain differently. If `compact_str` was not used, then your normal `String` would take 24 bytes of stack space (regardless of the string siz

No, let me try to explain differently. If `compact_str` was not used, then your normal `String` would take 24 bytes of stack space (regardless of the string size) + heap space. What `compact_str` is trying to do is not use heap when string content is less than 24.