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Output for 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5
array ( '2015-09-23' => array ( 'user' => array ( 0 => 13, 1 => 12, ), 'count' => array ( 'count' => 2, 'total' => 2, ), ), '2015-09-24' => array ( 'user' => array ( 0 => 14, ), 'count' => array ( 'count' => 1, 'total' => 3, ), ), '2015-09-25' => array ( 'user' => array ( 0 => 15, ), 'count' => array ( 'count' => 1, 'total' => 4, ), ), '2015-09-26' => array ( 'user' => array ( 0 => 16, ), 'count' => array ( 'count' => 1, 'total' => 5, ), ), '2015-09-27' => array ( 'user' => array ( 0 => 17, 1 => 18, ), 'count' => array ( 'count' => 2, 'total' => 7, ), ), '2015-09-28' => array ( 'user' => array ( 0 => 19, 1 => 20, 2 => 21, 3 => 22, 4 => 23, 5 => 24, 6 => 25, 7 => 26, 8 => 27, 9 => 28, ), 'count' => array ( 'count' => 10, 'total' => 17, ), ), )

preferences:
75.99 ms | 414 KiB | 5 Q