On: Perl 7 is going to be Perl 5.32, mostly

[Spivak]

A pure bash alternative for comparison.

    merge-args() {
        local res
        for i; do
            case ":${res}:" in
                *:"$i":*)
                    ;;
                *)
                    res=${res+$res:}$i
            esac
        done
        echo $res
    }

[gkfasdfasdf → Spivak]

That is pretty neat, I did not know that 'for i' on it's own could iterate the args like that.