Swift and Objective-c framework exposes its internals

I’m trying to integrate Swift into an existing objective-c framework that has public, private and project files. In order for swift to access the project files, I added a modulemap that defines a new module (e.g MyFramework_Internal) by including all the project headers as explained here: http://nsomar.com/project-and-private-headers-in-a-swift-and-objective-c-framework/

That setup is sort of working but one thing I was surprised to see is that now a client can access the internal classes by importing MyFramework_Internal (@import MyFramework_Internal). Is there a way to hide the module since it's only needed by the framework itself? The modulemap looks like this now:

module MyFramework_Internal {  
   header "Folder1/Baz.h"  
   header "Folder1/Folder2/Bar.h"  
   export *
} 

from Swift and Objective-c framework exposes its internals