public function get_changed_wp_object_attributes() {
		$changed = array();

		foreach ( $this->get_wp_object_keys() as $key ) {
			if ( $this->get_attribute( $key ) !==
				 $this->get_original_attribute( $key )
			) {
				$changed[ $key ] = $this->get_attribute( $key );
			}
		}

		return $changed;
	}