<?php
class 🥃whisky
{
    public    string     $name;
    public    int        $age;
    private   Distillery $distillery;
}

$whisky = new 🥃whisky;
$whisky->age = "29";

var_dump($whisky);
?>
Output
object(🥃whisky)#455 (1) { ["name"]=> uninitialized(string) ["age"]=> int(29) ["distillery":"🥃whisky":private]=> uninitialized(Distillery) }

Type-coercion when strict_types=0