[php-src] Issue #8344: Attribute parameters cannot contain BackedEnum values

Issue: https://github.com/php/php-src/issues/8344 Comment Author: michnovka @damianwadley I tried to make the example as minimal as possible. The reason why not use the enum directly is that I need it as an array key for my implementation ```php <?php enum Status: string { case DRAFT = 'draft'; case PUBLISHED = 'published'; case ARCHIVED = 'archived'; } #[Attribute] class ListensTo { public array $events; public function __construct(array $events) { $this->events = $events; } } #[ListensTo([Status::DRAFT->value => true])] class TestClass {} ``` This Attribute is from a 3rd party library and I cannot change it. The key values correspond to values of enum cases I have specified elsewhere in the project. So now I have to have "magic strings" like ```php #[ListensTo(['DRAFT' => true])] ``` And when I change Status::DRAFT, I need to change it on more places.