IDs can be strings, RevisionableStorageInterface::loadRevision should accept string ids (#895)

ids can be strings

Author: dpi

stubs/Drupal/Core/Entity/RevisionableStorageInterface.stub

@@ -5,7 +5,7 @@ namespace Drupal\Core\Entity;
 interface RevisionableStorageInterface extends EntityStorageInterface {
 
   /**
-   * @param int|numeric-string $revision_id
+   * @param int|numeric-string|string $revision_id
    * @return \Drupal\Core\Entity\RevisionableInterface|null
    */
   public function loadRevision($revision_id);