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@_ > 2 && return $_[0]->SUPER::add(@_[1..$#_]);

sub add {
    # check if the Big Boss is calling us...
...
    die "not a number" unless $value =~ /^\d+$/;
    $$self += $value;
}

add($duration)

add(duration => $duration)

return $self->SUPER::add(duration=>$duration);