Follow up of the issue#13469 to (a bit late) give my opinion on it.

This was about the presence in "subscribers and locator" doc where we can still seeContainerInterface being used.

I know we don't have the full container in a locator, but why not recommending usingServiceProviderInterface, the direct interface ofServiceLocator, which extendsContainerInterface ?

It would be less confusing about the deprecation ofContainerInterface usage but still seeing it on some part of the doc, even if unrelated.

Should we change the locator doc to showServiceProviderInterface