Another "uninitialized" thing..

Uninitialized typed properties 3.bug

$foo = new class() {
    var ?array $a;
    function dump() { var_dump($this->a); }
    function sort() { ksort($this->a); }
};

// E1: Error: Typed property class@anonymous::$a must not be accessed before initialization
$foo->dump();

// E2: TypeError: ksort() expects parameter 1 to be array, null given (should throw E1 cos its an uninitialized property?)
$foo->sort();