### 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
return new Promise(resolve=> setTimeout(resolve, ms));
}
const pipelineAsync = util.promisify(stream.pipeline);
const finishedAsync = util.promisify(stream.finished);
function toleranceRange(positive, negative) {
  const p = (1 + 1 / positive);
  const n = (1 / negative);
  return (actualValue, value) => {
    return actualValue - value > 0 ? actualValue < value * p : actualValue > value * n;
  }
}
var noop = ()=> {};
const LOCAL_SERVER_URL = 'http://localhost:4444';
function startHTTPServer(options) {