message: Don't export the node descriptions to scenegraph JSON.
  They take a lot of space, yet provide little value.
  (20-25% of a .sg file for descriptions)
diff: @@ -67,8 +67,10 @@ inline void to_json(JSON &j, const Node &n)
  {"type", NodeTypeToString[n.type()]},
  {"subType", n.subType()}};
  - if (n.description() != "<no description>")
  - j["description"] = n.description();
  + // Don't export the node descriptions to JSON. They take a lot of space, yet
  + // provide little value. (20-25% of a .sg file for descriptions)
  + //if (n.description() != "<no description>")
  + // j["description"] = n.description();
  // we only want the importer and its root transform, not the hierarchy of
  // geometry under it
  