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====== Option +write_nil_value+
Specifies the object that is to be substituted for each +nil+ field.
Default value:
CSV::DEFAULT_OPTIONS.fetch(:write_nil_value) # => nil
Without the option:
str = CSV.generate_line(['a', nil, 'c', nil])
str # => "a,,c,\n"
With the option:
str = CSV.generate_line(['a', nil, 'c', nil], write_nil_value: "x")
str # => "a,x,c,x\n"
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