On reload, the namespaces are safe, won't be reloaded. The loader only reloads what it manages, which in this case is the adapter itself.

In this example, we still want app/models/shapes/circle.rb to define Circle, not Shapes::Circle. This may be your personal preference to keep things simple, and also avoids refactors in existing code bases. The collapsing feature of Zeitwerk allows us to do that:

pp Rails.autoloaders.main.dirs

People want to autoload from lib, which is understandable. If we can, this use case should have first-class support from the framework.