Extend does not apply to abstract/aliases

[ghostwriter]

$container->alias(ListenerProviderInterface::class, ListenerProvider::class);
$container->extend(ListenerProvider::class, ListenerProviderExtension::class);

^ this works.

——

$container->alias(ListenerProviderInterface::class, ListenerProvider::class);
$container->extend(ListenerProviderInterface::class, ListenerProviderExtension::class);

^ The extension is not applied to ListenerProvider because the builder uses the resolved service name instead of the requested service name.