The list to insert into.
The items to insert, one per index, in the same order.
One position per item, in ascending order, counted on the list as it was before any insertion; a wrong count or order throws.
OptionalcloneWhen true, the list is deep-copied first so the input is never changed; when false the items are inserted in place.
A list, several items and one position per item for
lists.addItemsAtIndexes.