// *** before: ***
final class Point {
    public function __construct(
        public readonly float $x,
        public readonly float $y,
    ) {}
    // every property has to repeat "readonly" by hand
}

// *** in version 8.2: ***
final readonly class Point {
    public function __construct(
        public float $x,
        public float $y,
    ) {}
    // all properties of the class are readonly automatically
}