Error JSON response aren't being parsed

I noticed a JSON response with status `200` is parsed successfully by superagent (i.e. `response.body` contains the parsed JSON contents), but a JSON response with status `400` does not return a "body" property, even though the Content Type is "application/json". Any setting I'm missing to automatically parse error responses if the error content type is "application/json"?

My current workaround is to use:

``` js
var parsedError = JSON.parse(e.response.text);
```