hook before they are serialized and sent to the server.
	 *
	 * @access public
	 *
	 * @param array $args The hook parameters.
	 * @return array $args The expanded hook parameters.
	 */
	public function expand_term_taxonomy_id( $args ) {
		list( $term_taxonomy_ids,  $previous_end ) = $args;

		return array(
			'terms'        => get_terms(
				array(
					'hide_empty'       => false,
					'term_taxonomy_id' => $term_taxonomy_ids,
					'orderby'          => 'term_taxonomy_id',
					'order'            => 'DESC',
				)
			),
			'previous_end' => $previous_end,
		);
	}

	/**
	 * Gets a term object based on a given row from the term_relationships database table.
	 *
	 * @access public
	 *
	 * @param object $relationship A row object from the term_relationships table.
	 * @return object|bool A term object, or false if term taxonomy doesn't exist.
	 */
	public function expand_terms_for_relationship( $relationship ) {
		return get_term_by( 'term_taxonomy_id', $relationship->term_taxonomy_id );
	}

}