docs: public static SoyValue callLegacySoyFunction(
        LegacyFunctionAdapter fnAdapter, List<SoyValue> args) {
      for (int i = 0; i < args.size(); i++) {
        if (args.get(i) == null) {
          args.set(i, NullData.INSTANCE);
        }
      }
      return handleTofuNull(fnAdapter.computeForJava(args));
    }