docs: public DiffNode getChild(final ElementSelector elementSelector)
  	{
  		if (elementSelector instanceof CollectionItemElementSelector && childIdentityStrategy != null)
  		{
  			return children.get(((CollectionItemElementSelector) elementSelector).copyWithIdentityStrategy(childIdentityStrategy));
  		}
  		else
  		{
  			return children.get(elementSelector);
  		}
  	}