How do I make private functions in a Perl module?

Question

I am working on a little Perl module and for some reason I had the test driver script that was using my new module call one of the functions that I thought would be private,

Answer 1

There is only "The Kludge" of storing a code reference in a lexical variable, which no one outside that scope can see:

my $priv_func1 = sub { my $self = shift; say 'func1'; };

sub public_sub { 
    my $self = shift;

    $priv_func1->( $self );
}

And I can't think of a way to make rigorously "protected" fields.

That's it as far as I know ( besides source filters...shhhh. I didn't mention them.... )

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EDIT: Actually, it turns out I can think of a very messy way of doing protected. But it would probably involve passing all calls through the AUTOLOAD sub. (!!)