🐛 Bug Report

Using styles: cache option with ExcelJs.stream.xlsx.WorkbookReader produces error.

Lib version: 4.0.1

Steps To Reproduce

const workbookReader = new excel.stream.xlsx.WorkbookReader(fileReadStream, { worksheets: 'emit', styles: 'cache', sharedStrings: 'cache', hyperlinks: 'ignore', entries: 'ignore' });
    workbookReader.read();
    workbookReader.on('worksheet', worksheet => { 
         worksheet.on('row', (row) => {...}
     }

Above code will throw an error when the DD/MM/YYYY format date is given in the excel
e.g: 20/06/2020

The expected behaviour:

It should work fine with the given date

Possible solution :

Created a pull request to handle it: #1328

Other Inputs
Without styles:cache it works for DD-MM-YYYY format but treats it as string