$XDG_CONFIG_HOME/pacman/makepkg.conf not work, /etc/makepkg.conf does

[test482]

based on #483, my ~/.config/pacman/makepkg.conf

$ cat ~/.config/pacman/makepkg.conf
# Parallel compilation
MAKEFLAGS="-j$(nproc --ignore=1)"

# Skips compression
PKGEXT='.pkg.tar'

# No debug packages
OPTIONS=(!debug)

will case

Could not add packages to repo:
    paru now expects local repos to be writable as your user:
    You should chown/chmod your repos to be writable by you:
    chown -R eliot: /var/lib/repo/aur
错误： 未能运行： repo-add -R /var/lib/repo/aur/aur.db.tar.gz /var/lib/repo/aur/xpadneo-dkms-git-0.9.r226.ga16acb0-1-any.pkg.tar

after edit /etc/makepkg.conf to PKGEXT='.pkg.tar', chroot build works.

Is this expected behavior?