title: Multiple calls to state updater from useState in component causes multiple re-renders
body: <p>I'm trying React hooks for the first time and all seemed good until I realised that when I get data and update two different state variables (data and loading flag), my component (a data table) is rendered twice, even though both calls to the state updater are happening in the same function. Here is my api function which is returning both variables to my component.</p>
  
  <pre><code>const getData = url =&gt; {
  
      const [data, setData] = useState(null);
      const [loading, setLoading] = useState(true);
  
      useEffect(async () =&gt; {
  
          const test = await api.get('/people')
  
          if(test.ok){
              setLoading(false);
              setData(test.data.results);
          }
  
      }, []);
  
      return { data, loading };
  };
  </code></pre>
  
  <p>In a normal class component you'd make a single call to update the state which can be a complex object but the "hooks way" seems to be to split the state into smaller units, a side effect of which seems to be multiple re-renders when they are updated separately. Any ideas how to mitigate this?</p>