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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…

The task

Ruby 2.6 introduced `Enumerator::ArithmeticSequence`, produced by methods like `Integer#step` and `Range#step` on beginless/endless ranges. Numo::NArray currently raises an error or returns incorrect results when such objects are passed as array indices.

Part of Lego-X/LegoFlow-SWE.