MasterPress 1.3.1 is a compatibility release for PHP 8 and WordPress 5.7. It still remains backwards compatible with older PHP versions.
MEOW_Post :: incoming_users( $args = array() )
Retrieves all users that are related to this post via of the Related User field type. This method is a specialisation of WordPress’ get_users method, and as such, it can take arguments that will further clarify the users you want to retrieve, noting that the “include” argument is reserved for this method.
$args = array()
An arguments array or string, as used in the WordPress function get_users, which uses the same defaults as that function