You know what it does. It throws for <= 0
Created attachment 572370 [details] [diff] [review]
Not too bad!
Created attachment 572371 [details] [diff] [review]
Forgot to add the test.
The documentation has been done by Grendel: https://developer.mozilla.org/en/IndexedDB/IDBCursor#advance
I only added an entry into https://developer.mozilla.org/en/Firefox_10_for_developers