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          $self->{major} = $self->unknown( key      => 'major',
                                           prompt   => "Enter major version",
                                           callback => sub { /^\d+$/ },
                                           error    => "Not a number")
            unless defined $self->{major};
      }

      return $self->{version};
  }

Finally, the C<confirm()> method should be used to verify core pieces of data
that significant numbers of other methods rely on. Typically such data are
executables or configuration files from which will be drawn other meta data.
Most often, such major data points will be sought in the object constructor.
Here's an example:

  sub new {
      # Construct the object so that handlers will work properly.
      my $self = shift->SUPER::new(@_);

      # Try to find the executable.