def post_process_all(raw_outputs, normalize, chomp)
      Array.new.tap do |result|
        raw_outputs.each { |raw_output| result << post_process(raw_output, normalize, chomp) }
      end
    end
Post-process command output and return an array of the results

@param raw_outputs [Array] the output to post-process
@param normalize [Boolean] whether to normalize the output of each writer
@param chomp [Boolean] whether to chomp the output of each writer

@return [Array<String, nil>] the processed output of each command output object that supports `#string`

@api private