symfony: Service with dots in names can't be used for service subscription

Symfony version(s) affected: 4.x.x, 5.x.x

Description
According to the coding standards multiple services for the same class can be divided in groups separated with dots, e.g. something.service_name

But for service subscribers there is a regular expression that does not allow dots, so aliases can’t be used as types, and a check that service type as FQCN exists

I have >20 services with same interface and different aliases, but there is no “main service” to assign an interface for - they are equal.

If I use a combination of an existing alias and an FQCN as a service type in a service subscriber while interface is not registered as a service, compiler throws an exception The service “My\CommandBus” has a dependency on a non-existent service “[FQCN]”.

Do I have to declare a boilerplate stub as service record with FQCN just to pass the check?

There are several hundreds of developers in a project, declaring an interface as a service will create unpredictable side effects for those who use it as a parameter type already.

How to reproduce

1. declare a service by FQCN and an alias with different parameters with dots in a name

  my.sorted_set:
    class: DataStructures\Implementations\MysqlSortedSet
    arguments:
    - "dbServerName"
  re.sorted_set:
    class: DataStructures\Implementations\RedisSortedSet
    arguments:
    - "redisServerName"

1. Declare a service subscription with

class CommandBus implements \Symfony\Contracts\Service\ServiceSubscriberInterface
{
    public static function getSubscribedServices()
    {
        return ['my.sorted_set'=>\DataStructures\SortedSetInterface::class];
    }
}