OIFS="$IFS"
arr=(a b c)

recho ${arr[@]@Q}
recho "${arr[@]@Q}"

IFS="'"
recho ${arr[@]@Q}
recho "${arr[@]@Q}"
IFS="$OIFS"

arr=("'a'" "'b'" "'c'")

IFS="'"
recho ${arr[@]}
recho "${arr[@]}"
IFS="$OIFS"

IFS="'"
a="'a'"
recho $a
recho "$a"
IFS="$OIFS"

set -- "'a'" "'b'" "'c'"

IFS="'"
recho "${@}"
recho "$@"
