Cloning original node multiple times with clone user enabled causes an error

I have the same issue still in the 2.x Version of entity_clone.
The issue I have is with cloning a user more than once.

Steps to reproduce:
1. Create a user with name "user_original"
2. Clone the user the first time. No errors occur. The user gets cloned correctly.
3. Clone the "original" user once again. Now I get the "integrity constrained violation"

Drupal\Core\Entity\EntityStorageException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'user_original_cloned-de' for key 'user__name': INSERT INTO "users_field_data" ("uid", "langcode", "preferred_langcode", "preferred_admin_langcode", "name", "pass", "mail", "timezone", "status", "created", "changed", "access", "login", "init", "default_langcode") VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12, :db_insert_placeholder_13, :db_insert_placeholder_14); 

I w ill try to provide a patch, that makes the cloned username unique by adding a suffix to the cloned username if needed.

Patch works and I don't see the error anymore.
below code snippet from MR loops 'n' number of time for given username in db, instead have query to get latest(stored) user starts with $username.
ex. lwt say db has 5 user with as below

1. original
2. original_cloned
3. original_cloned_1
4. original_cloned_2
5. original_cloned_3
6. original_cloned_4

here latest entry is original_cloned_4 then explode with '_' and get last item + 1, which will gives '5'.

@megadesk3000 what you say about this approach?

+  protected function getUniqueUserName($username) {
+    $storage = $this->entityTypeManager->getStorage('user');
+    $original = $username;
+
+    $suffix = 0;
+    while ($matches = $storage->loadByProperties(['name' => $username])) {
+      $username = $original . '_' . $suffix++;
+    }
+
+    return $username;
+  }
+

Verified and works as expected.

Merged, release to follow shortly.