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  • Thank you. Yes, refinement is a solution. But I think this deviates from the original idea of default argument in function. Commented Apr 13, 2021 at 13:40
  • I'm afraid it's not possible in Red. You can also try to use block as an argument, and block can have as many elements as you want. But that's just a workaround. Commented Apr 13, 2021 at 19:02