Optional
Specify where the cursor should start from (inclusive). IDBCursor.continue is used if primaryKey is undefined. If it is not, IDBCursor.continuePrimaryKey is used instead.
Limit the number of results iterated
If specified, IDBCursor.advance is used before iteration.
Specify where the cursor should start from (inclusive). IDBCursor.continue is used if primaryKey is undefined. If it is not, IDBCursor.continuePrimaryKey is used instead.