protected function get_defaults() {

		return array(
			'attributes'        => array(),
			'checked'           => false,
			'columns'           => 12,
			'classes'           => array(), // Or string of space-separated classes.
			'data_store'        => 'usermeta', // Users or usermeta.
			'data_store_key'    => '', // Defaults to value passed for "name".
			'description'       => '',
			'default'           => '',
			'disabled'          => false,
			'id'                => '',
			'label'             => '',
			'label_show_empty'  => false,
			'last_column'       => true,
			'match'             => '', // Test.
			'name'              => '', // Defaults to value passed for "id".
			'options'           => array(),
			'options_preset'    => '',
			'placeholder'       => '',
			'required'          => false,
			'selected'          => '', // Alias of "default".
			'type'              => 'text',
			'value'             => '',
			'visibility_toggle' => false,
			'wrapper_classes'   => array(), // Or string of space-separated classes.
		);
	}