Manual:$wgAllUnicodeFixes

Details
Whether to always convert certain Unicode sequences to modern ones regardless of the content language. This has a small performance impact.

See arabic>Special:MyLanguage/Manual:$wgFixArabicUnicode|$wgFixArabicUnicode and malayalam>Special:MyLanguage/Manual:$wgFixMalayalamUnicode|$wgFixMalayalamUnicode for conversion details.