Hi, when I do this:

book = Spreadsheet::Workbook.new
sheet = book.create_worksheet
sheet.row(0).replace [1, 2, 3.4]
book.write "excel.xls"

And open the generated file, Excel show the error: "data could be
lost", and when it open the sheet it contains a wrong number in cell
C1... I'm doing something wrong?

(Tested on spreadsheet-0.6.1.9)

Thanks in advance.