The global package db directory of GHC has duplicate files (*.copy)
/opt/ghc/9.8.1/lib/ghc-9.8.1/lib/package.conf.d % ll
total 1272
-rw-r--r-- 1 phadej phadej 1788 loka 10 10:56 array-0.5.6.0-88aa.conf
-rw-rw-r-- 1 phadej phadej 1788 loka 10 10:56 array-0.5.6.0-88aa.conf.copy
I checked versions 9.4.6, 9.6.2 and 9.8.1. All have these *.copy
files. The 9.2.8 doesn't have.