### Describe the bug

When upgrading from `1.2.0-alpha.1` to just `1.2.0` the config `transformResponse` sends data as binary instead of string.

### To Reproduce

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### Code snippet

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### Expected behavior

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### Axios Version

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### Adapter Version

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### Browser

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### Browser Version

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### Node.js Version

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### OS

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### Additional Library Versions

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### Additional context/Screenshots

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lib/adapters/http.js
data = stream.Readable.from(data, {objectMode: false});
      }
      data = stream.pipeline([data, new AxiosTransformStream({
        length: utils.toFiniteNumber(contentLength),
        maxRate: utils.toFiniteNumber(maxUploadRate)
      })], utils.noop);
      onUploadProgress && data.on('progress', progress => {
        onUploadProgress(Object.assign(progress, {
          upload: true
        }));
      });
    }
    
    let auth = undefined;
    if (config.auth) {
      const username = config.auth.username || '';
      const password = config.auth.password || '';
      auth = username + ':' + password;
    }
    if (!auth && parsed.username) {
      const urlUsername = parsed.username;
      const urlPassword = parsed.password;
      auth = urlUsername + ':' + urlPassword;
    }
    auth && headers.delete('authorization');
    let path;
    try {
      path = buildURL(
        parsed.pathname + parsed.search,
        config.params,