tvanslyke added a comment. I think the only thing we need is a call to __set_long_cap(0) in the body of the if() to make the string be in a valid state, but if you follow the logic for a call to reserve(0) (after having called clear()) it doesn't even end up doing that (unless I'm missing something). I definitely have no problem adding the __set_long_cap(0) call to the diff.
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