Description:
------------
Little bit of hesitation on this one but I had to report it since no answers were found on SO 

https://stackoverflow.com/q/60087384/5999372

So uninitialized properties are hidden from get_object_vars but exposed to get_class_vars like as Null

Test script:
---------------
class A {
    public int $num1;
    public $num2;
}

var_dump(get_object_vars(new A));
var_dump(get_class_vars('A'));

Expected result:
----------------
array(1) {
  ["num1"]=>
  NULL
  ["num2"]=>
  NULL
}
array(2) {
  ["num1"]=>
  NULL
  ["num2"]=>
  NULL
}

Here to be honest I'm not sure whether get_class_vars should not show num1 and treat it as Null or whether get_object_class should show num1 either, but I assume they should output the same result especially since the properties are public.

Actual result:
--------------
array(1) {
  ["num2"]=>
  NULL
}
array(2) {
  ["num1"]=>
  NULL
  ["num2"]=>
  NULL
}