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====== Option +nil_value+
Specifies the object that is to be substituted for each null (no-text) field.
Default value:
CSV::DEFAULT_OPTIONS.fetch(:nil_value) # => nil
With the default, +nil+:
CSV.parse_line('a,,b,,c') # => ["a", nil, "b", nil, "c"]
With a different object:
CSV.parse_line('a,,b,,c', nil_value: 0) # => ["a", 0, "b", 0, "c"]