- Watcher improvements:
    - Test the limits of what watchers may do and select or create an appropriate type of proxy.
    - Add a module `$watch` method for dynamically attached watchers.
    - Add support for using a getter method rather than a path for watchers.
- Local function improvements:
    - Allow public use of local functions, or provide a public equivalent.
- General improvements:
    - Maybe, support open-state access on objects and arrays of a module.
- Project improvements:
    - Add additional features like those in
      [Arnav Gupta's Vuex Class Decorators](https://github.com/championswimmer/vuex-module-decorators).
    - Add AVA rules for ESLint.