### 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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test/unit/adapters/http.js
const options = { headers: {}, beforeRedirects: {} };
        __setProxy(options, test.proxyConfig, destination);
        for (const [key, expected] of Object.entries(test.expectedOptions)) {
          assert.equal(options[key], expected);
        }
      });
    }
  });
  it('should support cancel', function (done) {
    var source = axios.CancelToken.source();
    server = http.createServer(function (req, res) {
      // ca
      source.cancel('Operation has been canceled.');
    }).listen(4444, function () {
      axios.get('http://localhost:4444/', {
        cancelToken: source.token
      }).catch(function (thrown) {
        assert.ok(thrown instanceof axios.Cancel, 'Promise must be rejected with a CanceledError object');
        assert.equal(thrown.message, 'Operation has been canceled.');
        done();
      });
    });
  });
  it('should combine baseURL and url', function (done) {
    server = http.createServer(function (req, res) {
      res.end();
    }).listen(4444, function () {
      axios.get('/foo', {
        baseURL: 'http://localhost:4444/',
      }).then(function (res) {