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sub verify_args {
    my $defaults = shift; # leave the rest of @_ intact.
...
            unless exists $defaults->{$var};
    }
}

my %convert_defaults = (
    from  => 'here'
...
    my %args = (%convert_defaults, @_);
    ...
}

package KinoSearch::Util::Class;
use KinoSearch::Util::ToolSet; # strict, warnings, Carp, etc.
...
        . "abstract method and must be defined in a subclass.";
}

package KinoSearch::Analysis::Analyzer;
use KinoSearch::Util::ToolSet;
...
sub analyze { shift->abstract_death }

1;

package KinoSearch::Analysis::PolyAnalyzer;
use KinoSearch::Util::ToolSet;
...
}

1;