Parse numeric ranges for indexing.
Inclusive-inclusive 1-based integer ranges. Parsed from strings.
"2" => [2] "1-5" => [1, 2, 3, 4, 5] "1-3,5-6" => [1, 2, 3, 5, 6] "-3" => [1, 2, 3] "1-" => [1, 2, 3, ..] "1-3,2-4,7" => [1, 2, 3, 2, 3, 4, 7]