Cannot force a cell to be written as a string even if it 'looks like a number'

[KevinField]

I have a sheet of part numbers, which are not numbers. E.g. when I write 27E121 I mean the literal string "27E121", not the number 2.7e+122. I have tried setting Key123 to 1, setting $template->{FormatStr}->{$template->{Format}[$format_number]->{FmtIdx}} = '@', setting Type to 'Text', and even though the cell's value() is correct just before writing, if I reopen and parse the file and get the same cell's value() immediately after, it has been written as 2.7e+122 (or if I open it in Apache OpenOffice 4.)

I believe that this is because Spreadsheet-ParseExcel-0.65/lib/Spreadsheet/ParseExcel/SaveParser/Workbook.pm just calls $oWrS->write(), which then seems to ignore FormatStr, and/or Type, but I'm not sure. This is just my workaround, if I redefine SaveAs and just replace that write() with write_string(), all is well.