Unnecessary _xlfn prefix for SUMIFS

[BathoryPeter]

This is:

• a bug report

What is the expected behavior?

Save SUMIFS function to XLSX without _xlfn prefix.

What is the current behavior?

PhpSpreadsheet adds a _xlfn prefix to SUMIFS, which breaks LO Calc compatibility.

What are the steps to reproduce?

I think SUMIFS function was mistakenly categorized as released in Excel 2019 in FunctionPrefix.php#L133
. As I can see it was added in Excel 2007.

What features do you think are causing the issue

• Formula Calculations

Does an issue affect all spreadsheet file formats? If not, which formats are affected?

XLSX

Which versions of PhpSpreadsheet and PHP are affected?