#26: heartbeat_nopriv_received

heartbeat_nopriv_received.php

<?php
/**
 * Example 'Marco, Polo' Heartbeat nopriv data received filter.
 *
 * Based on an original Gist by Jason Coleman (https://gist.github.com/strangerstudios/5888123)
 *
 * @see wp_ajax_nopriv_heartbeat()
 *
 * @param array|object $response The response object.
 * @param array $data An array of $_POST data.
 * @param string $screen_id The screen id.
 *
 * @return mixed The filtered response.
 */
function wpdocs_heartbeat_received( $response, $data, $screen_id ) {
	if ( $data['client'] == 'marco' )
		$response['server'] = 'polo';

	return $response;
}
add_filter( 'heartbeat_nopriv_received', 'wpdocs_heartbeat_received', 10, 3 );

Shouldn't the 2 on line 21 be a 3? or remove $screen_id from the passed-in parameters on line 15?