message: fix vs error getting confused about which ctr to use
diff: @@ -170,7 +170,10 @@ template <class ObjectType, int ElementSize>
  class ArrayFixedBytesNull : public ArrayFixedBytes<ObjectType, ElementSize> {
  public:
  using Parent = ArrayFixedBytes<ObjectType, ElementSize>;
  - using ArrayFixedBytes<ObjectType, ElementSize>::ArrayFixedBytes;
  + ArrayFixedBytesNull(Allocator& alloc) noexcept
  + : ArrayFixedBytes<ObjectType, ElementSize>(alloc)
  + {
  + }
  static util::Optional<ObjectType> default_value(bool nullable)
  {
  if (nullable)
  