class Optimist::IntegerOption

def parse(paramlist, _neg_given)
  paramlist.map do |pg|
    pg.map do |param|
      raise CommandlineError, "option '#{self.name}' needs an integer" unless param.is_a?(Numeric) || param =~ /^-?[\d_]+$/
      param.to_i
    end
  end
end

def type_format ; "=<i>" ; end