### 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 stream.Readable.from(async function* (){
    let dataLength = 0;
    while(dataLength < length) {
      const leftBytes = length - dataLength;
      const chunk = Buffer.alloc(leftBytes > chunkSize? chunkSize : leftBytes);
      dataLength += chunk.length;
      yield chunk;
      if (sleep) {
        await setTimeoutAsync(sleep);
      }
    }