message: Get rid of warnings in nullable.hpp
diff: @@ -59,7 +59,7 @@ public:
  * @param other Another `%Nullable` instance to copy.
  */
  Nullable(const Nullable& other) noexcept(std::is_nothrow_copy_constructible<T>::value)
  - : m_hasValue(other.m_hasValue)
  + : m_disengaged{}, m_hasValue(other.m_hasValue)
  {
  if (m_hasValue)
  {
  @@ -73,7 +73,7 @@ public:
  * @param other A `%Nullable` instance to move into the instance being constructed.
  */
  Nullable(Nullable&& other) noexcept(std::is_nothrow_move_constructible<T>::value)
  - : m_hasValue(other.m_hasValue)
  + : m_disengaged{}, m_hasValue(other.m_hasValue)
  {
  if (m_hasValue)
  {
  