message: Fix FixedCapacityVector destructor.
  std::allocator::deallocate() expects the same value that was given
  during allocate().
  Interestingly, this bug did not manifest any issues (even with ASAN) on
  some platforms.
diff: @@ -108,7 +108,7 @@ public:
  ~FixedCapacityVector() noexcept {
  destroy(begin(), end());
  - allocator().deallocate(data(), size());
  + allocator().deallocate(data(), capacity());
  }
  FixedCapacityVector& operator=(FixedCapacityVector const& rhs) {
  