message: Fix FixedCapacityVector::reserve()
  We were initializing the new data with the default
  Actor by accident.
diff: @@ -276,7 +276,7 @@ public:
  UTILS_NOINLINE
  void reserve(size_type c) {
  if (c > capacity()) {
  - FixedCapacityVector t(c, allocator());
  + FixedCapacityVector t(construct_with_capacity, c, allocator());
  t.mSize = size();
  std::uninitialized_move(begin(), end(), t.begin());
  this->swap(t);
  