Add support for _xlfn. prefixed functions + implement ISFORMULA #390
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Why this change is needed?
This change adds support for newer functions that are prefixed by _xlfn. (#356). The calculation engine has been updated to recognise these as functions, and drop the _xlfn. part. I've added a couple of the new functions such as STDEV.S/P, MODE.SNGL, ISFORMULA.
Whilst testing ISFORMULA, I see that loading and saving a spreadsheet that contains true or false values, without making any modifications causes the spreadsheet to contain integer 0 or 1 when loaded again in Excel. Could the following code block be added here
PhpSpreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
Line 1058 in 0084776
to resolve this?
Let me know if my PR needs amending.