Issue: Numo::NArray does not accept Enumerator::ArithmeticSequence objects for indexing, slicing, or element…

Issue: Numo::NArray does not accept Enumerator::ArithmeticSequence objects for indexing, slicing, or element…: a task in LegoFlow-SWE (Harbor dataset). Ruby 2.6 introduced Enumerator::ArithmeticSequence , produced by methods like Integer step and Range step on beginless/endless ranges…