Hi-I'm immensely thankful for this book, of which I've used version 6 and version 7. I was implementing the cleaner version of IndexedDB that appears in version 7 today, and noticed that in safari, I ran into a Not Found Error: Store Not Found IndexedDB API issue when the db shared the same name as the store that was being created.
I found that making the database name unique (appending "_db") solved the problem.