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*_with_capacity(0) allocates, and malloc may return a valid pointer that needs to be freed, even when 0 size is specified.
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*_with_capacity(0) allocates, and malloc may return a valid pointer that needs to be freed, even when 0 size is specified. This behavior might be valgrind-specifiec? but malloc(0) is indeed implemenation-defined. An alternative would be to have
cap ? _i_new_n(_m_value, cap) : NULLin the*_with_capacityimplementation, and a few other places.