tvanslyke added a comment. Just to elaborate, in `reserve(0)` after the deallocation there's a check `if (__now_long)` which takes the else branch and only ends up calling `__set_short_size(__sz); // __sz = 0 here`. So even without this diff the only thing `reserve(0)` does after deallocating is set the short size to zero, but it already is zero (because of the call to `clear()`).
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