Wrong.

Closing this ITS.

Sorry but can you re-visit this please?

Suppose a MDB_IDL points to [5, 9,7,5,3,1] where the first element denotes the number of elements.

[-inf, 1) => position 6; the first element less than or equal to 1 does not exist, thus it points outside of the list [1,3) => position 5 [3,5) => position 4 [5,7) => position 3 [7,9) => position 2 [9,inf) => position 1

Thanks!