Description:
------------
The uasort / uksort function does not work correctly

Test script:
---------------
<?php
$ar = [
    [393, 464],
    [-59, 180],
    [-342, 402],
    [-90, 135],
    [-302, 207],
];
uasort($ar, static fn($a, $b) : int => $a[0] > $b[0]);
var_dump($ar);



Expected result:
----------------
array(5) {
  [2]=>
  array(2) {
    [0]=>
    int(-342)
    [1]=>
    int(402)
  }
  [4]=>
  array(2) {
    [0]=>
    int(-302)
    [1]=>
    int(207)
  }
  [3]=>
  array(2) {
    [0]=>
    int(-90)
    [1]=>
    int(135)
  }
  [1]=>
  array(2) {
    [0]=>
    int(-59)
    [1]=>
    int(180)
  }
  [0]=>
  array(2) {
    [0]=>
    int(393)
    [1]=>
    int(464)
  }
}

Actual result:
--------------
array(5) {
  [1]=>
  array(2) {
    [0]=>
    int(-59)
    [1]=>
    int(180)
  }
  [2]=>
  array(2) {
    [0]=>
    int(-342)
    [1]=>
    int(402)
  }
  [4]=>
  array(2) {
    [0]=>
    int(-302)
    [1]=>
    int(207)
  }
  [3]=>
  array(2) {
    [0]=>
    int(-90)
    [1]=>
    int(135)
  }
  [0]=>
  array(2) {
    [0]=>
    int(393)
    [1]=>
    int(464)
  }
}