docs: public static SoyDict augmentMap(SoyValue sv1, SoyValue sv2) {
      SoyDict first = (SoyDict) sv1;
      SoyDict second = (SoyDict) sv2;
      Map<String, SoyValueProvider> map =
          Maps.newHashMapWithExpectedSize(first.getItemCnt() + second.getItemCnt());
      map.putAll(first.asJavaStringMap());
      map.putAll(second.asJavaStringMap());
      return DictImpl.forProviderMap(map, RuntimeMapTypeTracker.Type.LEGACY_OBJECT_MAP_OR_RECORD);
    }