Drupal dependency injection container dumper now supports iterator arguments for service definitions

Symfony services can have arrays of service references. This is useful when you want to collect a list of tagged services to iterate over. See https://symfony.com/doc/current/service_container/tags.html#reference-ta...

This is especially useful in situations where a request potentially can be satisfied by a lightweight service running early, so later (heavier) services do not need to be instantiated in every request.