Drupal 8 - What is the format for viewsreference arguments? I am using a views reference field inside a paragraph on a node. I know that I may add optional arguments but how should I format the arguments? Two things I would like to do are: 
 - Limit the number of results returned in the view to 3
 - Display only results with a certain taxonomy term 

Here is a screenshot of the arguments field in the paragraphs UI.
I'm see code ViewsReferenceFieldFormatter.php.

The argument field is treated as follows:

if (preg_match('/\//', $argument)) {
  $arguments = explode('/', $argument);
}


Hence argument have next format: tid/nid/custom_id