Libraries anvil lang sequence insert

sequence insert(int start, sequence elements)
sequence insert(int start, object element)
sequence insert(int start, int length, sequence elements)
sequence insert(int start, int length, object element)
Inserts given element (or elements) to this sequence. Some elements might be replaced if length > 0.
Parameters start -  Insertion position
length -  Length of sub sequence to overwrite
element -  Element to insert
elements -  Elements of compatible sequence are inserted
Returns Modified sequence, original or copy