mime.info currently categorizes DjVu files as BITMAP img_media_type, and that's also how CirrusSearch indexes them (https://commons.wikimedia.org/w/index.php?search=filetype%3Abitmap+filemime%3Aimage%2Fvnd.djvu&title=Special%3ASearch)
PDF files, on the other hand, are considered OFFICE.
Is there a reason DjVu files are not, like PDF files, also OFFICE?
If not: any other reason we wouldn't want to change that?
Who do we need to consult if we'd like to make that happen?