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   $arrayref = $csv->getline_all ($io);
   $arrayref = $csv->getline_all ($io, $offset);
   $arrayref = $csv->getline_all ($io, $offset, $length);

   lines call
   ----- ---------------------------------------------------------
...
   8..9  $csv->getline_all ($io, -2)     # last 2 rows
   6..7  $csv->getline_all ($io, -4,  2) # first 2 of last  4 rows

   $arrayref = $csv->getline_hr_all ($io);
   $arrayref = $csv->getline_hr_all ($io, $offset);
   $arrayref = $csv->getline_hr_all ($io, $offset, $length);