public void splice (uint position, uint n_removals, Object additions)
Changes this by removing
n_removals items and adding
additions.length items to it.
additions must contain
additions.length items of type
item_type. null is not permitted.
This function takes a ref on each item in
n_removals must be correct (ie:
n_removals must be
less than or equal to the length of the list at the time this function is called).
the position at which to make the change
the number of items to remove
the items to add
the number of items to add