set -eu

git init --initial-branch=main --object-format="$1" repo

git init --bare --initial-branch=main --object-format="$1" upstream

cd repo

git remote add origin ../upstream

tree=$(git mktree </dev/null)

commit=$(git commit-tree "$tree" -m initial)

git update-ref refs/heads/main "$commit"

for separator in $'\302\205' $'\342\200\250' $'\342\200\251'; do

git config --add remote.unicode.url "https://example.invalid/before${separator}after"

for prefix in refs/heads refs/tags refs/remotes/origin; do

for name in "${separator}after" "before${separator}after" "before${separator}"; do

git update-ref "$prefix/$name" "$commit"

done

done