still can't tell who's fault this is but i can take a wild guess that some packages maybe aren't behaving nicely, or at least, that multiple unrelated packages contribute to the contents of that dir (after uninstalling the

python36

package):

X> yaourt -Qo /usr/lib/python3.6
/usr/lib/python3.6/ is owned by gprof2dot 2017.9.19-1
/usr/lib/python3.6/ is owned by redshift-gtk-git 1.11.r132.g91e1d30-1