fix indexing of IntervalSet to be able to use `-1`#409

Merged

gviejo merged 3 commits intodevfrom fix_iset_index

Feb 6, 2025

+63-17

Commits on Feb 3, 2025

fix indexing of intervalset to be able to use -1, add additional test cases
sjvenditto
committed

Commits on Feb 6, 2025