Currently, incorrect property types defined in PHPDoc.
For example, in "eZ\Publish\Core\FieldType\Integer\Value"

 /**
     * Content of the value.
     *
     * @var int
     */
    public $value;

So, it's not clear for developer if this value will be 0 when not set.
And, if the developer created app-level value object following the same type, it will throw error.

class MyValueObject {
    public int $count;
}
// error here:
$objInstance->count = $content->getFieldValue('some_integer')->value;

PR: https://github.com/ezsystems/ezpublish-kernel/pull/3042