Description:
------------
var_dump() does not show named properties that were not initialized, 
it just shows that _something_ is there

Test script:
---------------
<?php

class A{
    public string $x;
}

var_dump(property_exists($A,'x'));//true
var_dump($A); //class A#1 (1) {} // - it counts the property, but hides it
var_dump(new stdClass()); //class stdClass#1 (0) {} - empty object

Expected result:
----------------
class A#1 (1) {
  public $x =>
  NULL
}

Actual result:
--------------
class A#1 (1) {
}