code: public @Nonnull Iterable<JsonArray> arrays() {
          final JsonArray parent=this;
          return () -> {
              final Iterator<JsonElement> iterator = parent.iterator();
              return new Iterator<JsonArray>() {
  
                  @Override
                  public boolean hasNext() {
                      return iterator.hasNext();
                  }
  
                  @Override
                  public JsonArray next() {
                      return iterator.next().asArray();
                  }
  
                  @Override
                  public void remove() {
                      iterator.remove();
                  }
              };
          };
      }
docs: Convenience method to prevent casting JsonElement to JsonArray when iterating in the common case that you have
  an array of JsonArrays.
  
  @return iterable that iterates over JsonArrays instead of JsonElements.