file_store interferes with deleting master bus state

[toomim]

If you have file_store enabled (which it is by default), then you can't delete state from the master bus.

This is because statebus doesn't yet gracefully handle multiple handlers implemented from different libraries, and file_store needs to know when something is deleted (e.g. on_delete) but all we expose now is the function for controlling deletes (e.g. to_delete).

I need to fix this design. Meanwhile, you can add this line to your code as a workaround:

bus('*').to_delete = (t) => {t.done()}

...where bus is the name of your master bus.