### 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
samples.slice(skip).forEach(({rate, progress}, i, _samples)=> {
        assert.ok(compareValues(rate, configRate),
          `Rate sample at index ${i} is out of the expected range (${rate} / ${configRate}) [${
            _samples.map(({rate}) => rate).join(', ')
          }]`
        );
        const progressTicksRate = 2;
        const expectedProgress = ((i + skip) / secs) / progressTicksRate;
        assert.ok(
          Math.abs(expectedProgress - progress) < 0.25,
          `Progress sample at index ${i} is out of the expected range (${progress} / ${expectedProgress}) [${
            _samples.map(({progress}) => progress).join(', ')
          }]`
        );
      });
      assert.strictEqual(data, buf.toString(), 'content corrupted');
    });
    it('should support download rate limit', async function () {
      const secs = 10;
      const configRate = 100_000;
      const chunkLength = configRate * secs;
      server = await startHTTPServer();
      const buf = Buffer.alloc(chunkLength).fill('s');
      const samples = [];
      const skip = 2;
      const compareValues = toleranceRange(10, 50);
      const {data} = await axios.post(LOCAL_SERVER_URL, buf, {
        onDownloadProgress: ({loaded, total, progress, bytes, rate}) => {
          samples.push({
            loaded,