use v6;
    
    multi sub foo-bar(Str $a, Str $b) { "str/str" }
    multi sub foo-bar(Str $a, Int $b) { "str/int" }
    multi sub foo-bar(Str $a, Num $b) { "str/num" }
    multi sub foo-bar(Str $a, Array $b) { "str/num" }
    {
        use v5;
        # oh shit, what now? do I:
        foo-bar("1", "2"); # syntax error
        call_perl6_func("foo-bar", "1", "2"); # calls, but breaks since Perl5 has no types
        # Maybe this instead:
        call_perl6_func("foo-bar", Perl6cast("Str", "1"), Perl6cast("Str", "2");
        {
            use v6;
            # now how do I call perl 5?
        }
    }