Problem: ContainerInterface returns array|bool|float|int|string|null as value.

This is causing false positive in phpstan analysis, when you know that returned value has a specific type and you try to use it. For example, if you retrieve a string using $container->getParameter('my_parameter'), you currently can't do a concatenation, since phpstan is complaining about Binary operation "." [...] results in an error

It would be nice if the plugin could be able to retrieve actual type from container and override the return type of getParameter method.