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//opt/alt/ruby34/share/gems/gems/csv-3.3.2/doc/csv/arguments/io.rdoc
* Argument +io+ should be an IO object that is: * Open for reading; on return, the IO object will be closed. * Positioned at the beginning. To position at the end, for appending, use method CSV.generate. For any other positioning, pass a preset \StringIO object instead.
