I have no idea what everyone is talking about. Inside-out objects where invented precisely to make it possible to inherit without knowing any superclass implementation details. The sole trick to that is to let your superclass set up the blessed reference for you, then rebless it into your own package. After all, you don’t even care what the reference actually contains, all you need is an address.

sub new {
    my ( $class, $samba ) = @_;
    my $self = $class->SUPER::new( $samba );
    $config_of{ ident $self } = $samba;
    return bless $self, $class;
}
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How else can File::Samba work, anyway, if you don’t let it initialise its own data structures by calling its constructor?

sub new {
    my ( $class, $samba ) = @_;
    my $self = $class->SUPER::new( $samba );
    $config_of{ ident $self } = $samba;
    return $class;
}
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Makeshifts last the longest.