Description:
------------
Incorrect collaboration of the reflection, magic method __toString and typed properties.

Test script:
---------------
class A
{
    private string $prop1 = '123';

    public function __toString()
    {
        return $this->prop1;
    }
}

class B
{
    private string $prop2;
}

$b = new B();

$reflector = new ReflectionClass($b);
$property = $reflector->getProperty('prop2');
$property->setAccessible(true);
$property->setValue($b, new A());


Expected result:
----------------
Property B::prop2 must have value '123'. No errors must happen.

Actual result:
--------------
PHP Fatal error:  Uncaught Error: Cannot access private property A::$prop1 in test.php:9
Stack trace:
#0 [internal function]: A->__toString()
#1 test.php(23): ReflectionProperty->setValue()
#2 {main}
  thrown in /home/sergey/www/twin.client/test.php on line 9