Forward port change from master.

src/Datasource/Paginator.php

@@ -195,7 +195,7 @@ class Paginator implements PaginatorInterface
 
         $order = (array)$options['order'];
         $sortDefault = $directionDefault = false;
-        if (!empty($defaults['order']) && count($defaults['order']) == 1) {
+        if (!empty($defaults['order']) && count($defaults['order']) === 1) {
             $sortDefault = key($defaults['order']);
             $directionDefault = current($defaults['order']);
         }