Inserts data into sequence using func to determine the new
position. The sequence must already be sorted according to cmp_func;
otherwise the new position of data is undefined.
cmp_func is called with two items of the seq and user_data.
It should return 0 if the items are equal, a negative value
if the first item comes before the second, and a positive value
if the second item comes before the first.
Since 2.14
Inserts data into sequence using func to determine the new position. The sequence must already be sorted according to cmp_func; otherwise the new position of data is undefined. cmp_func is called with two items of the seq and user_data. It should return 0 if the items are equal, a negative value if the first item comes before the second, and a positive value if the second item comes before the first. Since 2.14