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Note: This is a built-in category that MediaWiki will add pages to on its own and therefore it is normal and desirable for it to be completely empty. It was only created as an actual page to document this and include it on the Category:MaintenanceCategory page.
This is a maintenance category to help identify all the pages which contain invalid uses of the formatnum magic word. Unfortunately it seems to be prone to false positives when it's used on the result of a template or variable expansion. Generally these errors can probably be ignored.
Example:
{{formatnum:Not a Number}}
Pages in category "Pages with non-numeric formatnum arguments"
The following 2 pages are in this category, out of 2 total.