title: react native fetch returns Blob instead of JSON after upgrading to 0.24.1
body: <p>Hi so I’ve recently upgraded to 0.24.1 and I’m having problems with fetch. I’m getting similar issues as this <a href="https://github.com/facebook/react-native/issues/6025" rel="noreferrer">https://github.com/facebook/react-native/issues/6025</a> but body init is returning a Blob instead of JSON like it used to. I’ve made updates so it now takes the headers <code>Accept &amp; Content-Type</code> with <code>application/json</code> like they did in the issue above, but still no luck.</p>
  
  <pre><code>return fetch(`${auth0_api}/userinfo`, {
    method: 'GET',
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${access_token}`
    }
  </code></pre>
  
  <p>When I <code>console.log</code> the response I get:</p>
  
  <pre><code>{
    _bodyBlob: Blob
      size: 1144
      type: "application/json; charset=utf-8"
    _bodyInit:Blob
      size: 1144
      type: "application/json; charset=utf-8"
    headers: Headers
    ok: true
    status: 200
    statusText: undefined
    type: "default"
    url: ""https://lite.au.auth0.com/userinfo""
  }
  </code></pre>