Float.class_eval do
  alias_method :original_round, :round
  def round(decs = 0)
    if decs == 0
      self.original_round
    elsif decs > 0
      decs = decs.to_i
      (self * 10 ** decs).original_round.to_f / 10 ** decs
    else
      raise ArgumentError, "You can't pass negative arguments"
    end
  end
end