Make it possible to hydrate private props from parent classes

[veewee]

Feature Request

Q	A
New Feature	yes
RFC	yes/no
BC Break	yes/no

Summary

See https://3v4l.org/WQtLD

<?php

abstract class X {
    private string $x;
}

#[AllowDynamicProperties]
class Y extends X {}

$rc = new ReflectionClass(Y::class);
try {
    var_dump($rc->getProperties());
    var_dump($rc->getProperty('x'));
} catch (\Exception $e) {
    echo $e .PHP_EOL.PHP_EOL;
}

$y = new Y;

// Solution is to fetch prop from parent:
$xProp = $rc->getParentClass()->getProperty('x');
var_dump($xProp->setValue($y, 'hello'));

// Since its a dynamic class, fallback is:
    
$y->x = 1;
var_dump($y, $y->x);

// Which is ... odd :)

array(0) {
}
ReflectionException: Property Y::$x does not exist in /in/WQtLD:13
Stack trace:
#0 /in/WQtLD(13): ReflectionClass->getProperty('x')
#1 {main}

NULL
object(Y)#3 (2) {
["x":"X":private]=>
string(5) "hello"
["x"]=>
int(1)
}
int(1)

The root cause for this is this:
https://3v4l.org/kvVm0

class A {
    private string $id;
}

class B extends A {
    private int $id;
}
class C extends B {
    protected float $id;
}
class D extends C {
    public float $id;
}


$a = new A();
$b = new B();
$c = new C();
$d = new D();
var_dump($a, $b, $c, $d);

object(A)#1 (0) {
["id":"A":private]=>
uninitialized(string)
}
object(B)#2 (0) {
["id":"A":private]=>
uninitialized(string)
["id":"B":private]=>
uninitialized(int)
}
object(C)#3 (0) {
["id":"A":private]=>
uninitialized(string)
["id":"B":private]=>
uninitialized(int)
["id":protected]=>
uninitialized(float)
}
object(D)#4 (0) {
["id":"A":private]=>
uninitialized(string)
["id":"B":private]=>
uninitialized(int)
["id"]=>
uninitialized(float)
}

So to decide what to do with hydration : keep it simple and only run the action on the property that is directly available.
Or : trigger hydrating the property on all known props (on current and parents parents).
Not sure what makes sense here.