Yep, I don’t think it has ever existed. I can’t add it but I can give you some information on the field.
The user field returns either an user object that is the same as what is returned by get_userdata() https://codex.wordpress.org/Function_Reference/get_userdata
Or it returns an array that is constructed by using that information
$value = array( 'ID' => $user_id, 'user_firstname' => $wp_user->user_firstname, 'user_lastname' => $wp_user->user_lastname, 'nickname' => $wp_user->nickname, 'user_nicename' => $wp_user->user_nicename, 'display_name' => $wp_user->display_name, 'user_email' => $wp_user->user_email, 'user_url' => $wp_user->user_url, 'user_registered' => $wp_user->user_registered, 'user_description' => $wp_user->user_description, 'user_avatar' => get_avatar( $user_id ), );
And it returns either a single user or an array of users depending on the “Multiple” setting.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users
Helping others is a great way to earn karma, gain badges and help ACF development!