Description:
------------
Using the latest PHP version 8.1 RC 5

I would expect the ParameterUnionType to return the ReflectionNamedTypes in order in which they are defined at the method, but as it seems they are returned in a fixed order.

Test script:
---------------
<?php

class MyClass {
    public function __construct(int|string $value)
    {
    }
}

$reflectionMethod = new ReflectionMethod(MyClass::class, '__construct');
$parameterUnionType = $reflectionMethod->getParameters()[0]->getType();
$types = array_map(fn(ReflectionNamedType $type) => $type->getName(), $parameterUnionType->getTypes());
// Expected: ['int', 'string']
// Actual: ['string', 'int']


Expected result:
----------------
// Expected: ['int', 'string']

Actual result:
--------------
// Actual: ['string', 'int']