Phone numbers with leading +

[trapias]

Hello,
I have an issue with phone numbers which apparently is similar to issue #5 .
I generate my xlsx from json like:

 {
      "row": "1",
      "name": "John",
      "phone": "+411234567890"
    }

All data is interpreted as string by xlsx.js, but then Excel 2013 tells the file is corrupted; recoverig is successfull, but I wish to supress the error.
The problem is with the leading "+" char: if I remove it, or put an apice before it when I generate my excel rows, all works pretty good.

Is there a way to keep this char, but encode it so that Excel does not give errors opening file?
Thanks for any suggestion,
al.

[trapias]

I managed to let Excel open the file without errors by adding a blank after the + sign, e.g. passing the number as "+ 411234567890" instead of "+411234567890".
Would like anyway to understand if it's possible to better handle this.