Removed in T241352: Drop $wgFixArabicUnicode, deprecated and unused/T241353: Drop $wgFixMalayalamUnicode, deprecated and unused in bc41f44c5ecbb08aabdb18b9bf55132212411eb5 as part of 1.35.
I doubt these continue to serve much (any?) value longer term, especially as we're coming into the dev cycle for 2 LTS's after 1.35.