def push(x, n = 1)
      x = [x] unless x.is_a? Array
      x.each { |value| _digest(value, n) }
    end
def push(x, n = 1)
      x = [x] unless x.is_a? Array
      x.each { |value| _digest(value, n) }
    end
rubocop:enable Metrics/PerceivedComplexity, Metrics/CyclomaticComplexity
 rubocop:enable Metrics/AbcSize