Deploy New Version and List Contents

As part of my app (Client script) it contains a list

If I update this app with a new version (e.g. 1.0.0.1) are the contents of the list left intact.

e.g.

1. I create an app which has a list called "Data" that sits in the app site along with webparts etc. version 1.0.0.0

2. Users use the app and populate the list

3. I release a new version 1.0.0.1 to the store and people update their app

4. Does the app uninstall and reinstall or does it just update the differences leaving the list content intact?

Thanks

Rob