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