I regularly work with Views and recently I have had a few odd needs. One of which was when a user selects an item, that item then disappears from the view. The view has exposed filters with AJAX turned on. Since I don’t know how many items I’ll need to filter, I’ll need a way to pass multiple values through an exposed filter. Views apparently does not do this out of the box. If I was filtering on a content field setup for multiple values this may be easier. But no, I am filtering on nids. Since nids are a system field, Views sets the filter handler to 'views_handler_field_numeric'.