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Option quote_empty ↑

Specifies the boolean that determines whether an empty value is to be double-quoted.

Default value:

CSV::DEFAULT_OPTIONS.fetch(:quote_empty) # => true

With the default true:

CSV.generate_line(['"', ""]) # => "\"\"\"\",\"\"\n"

With false:

CSV.generate_line(['"', ""], quote_empty: false) # => "\"\"\"\",\n"