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====== Option +empty_value+
Specifies the object that is to be substituted
for each field that has an empty \String.
Default value:
CSV::DEFAULT_OPTIONS.fetch(:empty_value) # => "" (empty string)
With the default, <tt>""</tt>:
CSV.parse_line('a,"",b,"",c') # => ["a", "", "b", "", "c"]
With a different object:
CSV.parse_line('a,"",b,"",c', empty_value: 'x') # => ["a", "x", "b", "x", "c"]
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