set -euo pipefail
example_work=$(mktemp -d "${TMPDIR:-/tmp}/jq-yq-example.XXXXXX")
trap 'rm -rf -- "$example_work"' EXIT
cd "$example_work"
mkdir data
cat > data/samples.jsonl <<'JYQ_INPUT_1'
{"id":"A","site":"north","value":10}
{"id":"B","site":"south","value":20}
{"id":"C","site":"north","value":null}
JYQ_INPUT_1

jq -s 'map(.value // 0) | add' data/samples.jsonl