Sort::by, Sort::byDescending and Sort::user have the same results (DESC)

[KarelWintersky]

Source dataset

array (
  0 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-31',
  ),
  1 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-30',
  ),
  2 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-29',
  ),
)

After "by Ascending"

Sort::by($dataset, static function($element) {
    return $element['event_date'];
});

array (
  0 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-31',
  ),
  1 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-30',
  ),
  2 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-29',
  ),
)

After "by Descending":

Sort::byDescending($dataset, static function($element) {
    return $element['event_date'];
});

same result

array (
  0 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-31',
  ),
  1 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-30',
  ),
  2 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-29',
  ),
)

After user func:

Sort::user($dataset, static function($first, $second) {
    return $second['event_date'] <=> $first['event_date'];
    // return $first['event_date'] <=> $second['event_date']; // doesn't matter, same result
});

same result

BUT:

usort($dataset, static function($first, $second) {
    return $first['event_date'] <=> $second['event_date'];
});

return:

array (
  0 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-29',
  ),
  1 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-30',
  ),
  2 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-31',
  ),
)

as expected

usort($dataset, static function($first, $second) {
    return $second['event_date'] <=> $first['event_date'];
});

returns

array (
  0 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-31',
  ),
  1 => 
  array (
    'item_id' => '240113',    'event_date' => '2023-10-30',
  ),
  2 =>   array (
    'item_id' => '240113',    'event_date' => '2023-10-29',
  ),
)

As expected too