make content optional in Node type #62

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1 error and 10 warnings

Process completed with exit code 4.

negative steps are not supported in Enum.slice/2, pass 61..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 36..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 47..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 61..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 26..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 60..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 60..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 19..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 43..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 17..-1//1 instead