message: silenced a warning
diff: @@ -92,7 +92,7 @@ private:
  struct FreeSpaceEntry {
  uint64_t ref;
  uint64_t released_at_version;
  - uint32_t size;
  + uint64_t size;
  };
  std::vector<FreeSpaceEntry> m_free_in_file;
  std::vector<FreeSpaceEntry> m_not_free_in_file;
  