title: redux-form Field and Checkbox react-toolbox value checked from object
body: <p>I have this data:</p>
  
  <pre><code>...
  initialValues: {
    alarm: 'normal',
    days: { mon: true, tue: true, wed: true, thu: false, friday: true }
  }
  ...
  </code></pre>
  
  <p>to render, I do the following.</p>
  
  <pre><code>&lt;Field name="days" component={({ input }) =&gt; {
    return (
      &lt;div className='days-container'&gt;
        &lt;Checkbox label='Monday' checked={input.value.mon} onChange={input.onChange} /&gt;
        &lt;Checkbox label='Tuesday' checked={input.value.tue} onChange={input.onChange} /&gt;
        ...
      &lt;/div&gt;
    )
  }}/&gt;
  </code></pre>
  
  <p>but days value becomes Boolean:</p>
  
  <pre><code>days: true
  </code></pre>
  
  <p>as you would to maintain the initial structure?</p>