auto_flushing= (ActiveSupport::BufferedLogger)

    # File lib/active_support/buffered_logger.rb, line 84
        def auto_flushing=(period)
          @auto_flushing =
            case period
            when true;                1
            when false, nil, 0;       MAX_BUFFER_SIZE
            when Integer;             period
            else raise ArgumentError, "Unrecognized auto_flushing period: #{period.inspect}"
            end
        end