Improve Snapshot feature set

I've run into situations where I've deleted a task with a custom function, and later defined something with the same name using different code. What appears to be happening is that my function is fed old state in the "restore" function, and then the process dies. I have to add code to make sure that I'm not getting someone else's data to work around this.

Is there / could there be a way to clean out old snapshot state from the database?