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IFS='' # testing with only empty IFS
set -- this is a test
printf '|%s|\n' ${1+"$@"}
echo
printf '|%s|\n' "${1+$@}"
echo
printf '|%s|\n' "$@"
echo
printf '|%s|\n' ${1-"$@"}
printf '|%s|\n' "${1-$@}"
echo
: ${foo:="$@"}
printf '|%s|\n' "$foo"
unset foo
: "${foo:=$@}"
printf '|%s|\n' "$foo"
unset foo
printf '|%s|\n' ${foo-"$@"}
printf '|%s|\n' "${foo-$@}"
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