Change Details

MFC after: 3 days Sponsored by: Klara, Inc.

* Replace `random()` with `arc4random()`. * Change some variable types. * Drop some unused assignments. MFC after: 3 days Sponsored by: Klara, Inc.

* Replace `random()` with `arc4random()`. * Change some variable types. * Drop some unused assignments. MFC after: 3 days Sponsored by: Klara, Inc.