code: @SuppressWarnings("unchecked")
    public <T> T get(String... path) {
      ExtensionAware root = searchRoot;
      for (String name : path) {
        ExtensionContainer children = root.getExtensions();
        root = (ExtensionAware) children.getByName(name);
      }
      return (T) root; // this is potentially unchecked.
    }
docs: Get an extension by it's path, potentially will throw all kinds of exceptions. Be very careful.