panic(fmt.Errorf("empty args passed %v", args))
	}
	csvIn := io.Reader(readCloser)
	if args.RecordDelimiter != "\n" {
		csvIn = &recordTransform{
			reader:          readCloser,
			recordDelimiter: []byte(args.RecordDelimiter),
			oneByte:         make([]byte, len(args.RecordDelimiter)-1),
		}
	}

	r := &Reader{
		args:       args,
		buf:        bufio.NewReaderSize(csvIn, csvSplitSize*2),