Audio Transcribe Errors of 'Text' type

[klueless-io]

Describe the bug
I am seeing an issue in the Audio Transcribe routine for response_format type of 'text'.

Code works for: srt, json, verbose_json, srt and vtt
Does not work for: text

describe '#transcriptions' do
      # https://platform.openai.com/docs/api-reference/audio/createTranscription

      let(:file) { 'spec/sample_files/audio/01-introduction.mp3' }
      let(:model) { 'whisper-1' }
      # let(:response_format) { %w[json text srt verbose_json vtt].sample }
      let(:response_format) { 'text' }
      let(:parameters) { { file:  File.open(file, "rb"), model: model, response_format: response_format } }

      it 'transcribes audio' do
        L.kv 'Response Format', response_format
        puts 1
        response = client.audio.transcribe(parameters: parameters)
        puts 'does not reach this for text'
        puts response
        # L.json(response)
      rescue StandardError => e
        L.error e.message
      end
    end

I believe the error is coming from to_json

 def json_post(path:, parameters:)
      to_json(conn.post(uri(path: path)) do |req|
        if parameters[:stream].respond_to?(:call)
          req.options.on_data = to_json_stream(user_proc: parameters[:stream])
          parameters[:stream] = true # Necessary to tell OpenAI to stream.
        elsif parameters[:stream]
          raise ArgumentError, "The stream parameter must be a Proc or have a #call method"
        end

        req.headers = headers
        req.body = parameters.to_json
      end&.body)
    end

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.