message: Lift prevector default vals to the member declaration
diff: @@ -148,14 +148,14 @@ public:
  };
  private:
  - size_type _size;
  + size_type _size = 0;
  union direct_or_indirect {
  char direct[sizeof(T) * N];
  struct {
  size_type capacity;
  char* indirect;
  };
  - } _union;
  + } _union = {};
  T* direct_ptr(difference_type pos) { return reinterpret_cast<T*>(_union.direct) + pos; }
  const T* direct_ptr(difference_type pos) const { return reinterpret_cast<const T*>(_union.direct) + pos; }
  @@ -246,34 +246,34 @@ public:
  fill(item_ptr(0), first, last);
  }
  - prevector() : _size(0), _union{{}} {}
  + prevector() {}
  - explicit prevector(size_type n) : prevector() {
  + explicit prevector(size_type n) {
  resize(n);
  }
  - explicit prevector(size_type n, const T& val) : prevector() {
  + explicit prevector(size_type n, const T& val) {
  change_capacity(n);
  _size += n;
  fill(item_ptr(0), n, val);
  }
  template<typename InputIterator>
  - prevector(InputIterator first, InputIterator last) : prevector() {
  + prevector(InputIterator first, InputIterator last) {
  size_type n = last - first;
  change_capacity(n);
  _size += n;
  fill(item_ptr(0), first, last);
  }
  - prevector(const prevector<N, T, Size, Diff>& other) : prevector() {
  + prevector(const prevector<N, T, Size, Diff>& other) {
  size_type n = other.size();
  change_capacity(n);
  _size += n;
  fill(item_ptr(0), other.begin(), other.end());
  }
  - prevector(prevector<N, T, Size, Diff>&& other) : prevector() {
  + prevector(prevector<N, T, Size, Diff>&& other) {
  swap(other);
  }
  