title: react-hooks-forms and default checked radio button
body: <p>I am using react hooks forms and has tried most thing to default check a radio button:</p>
  
  <pre><code>&lt;FormGroup tag="fieldset"&gt;
    &lt;FormGroup check&gt;
      &lt;Label check&gt;
        &lt;Input type="radio" name="isIBAN" innerRef={register} defaultChecked/&gt; IBAN
      &lt;/Label&gt;
    &lt;/FormGroup&gt;
    &lt;FormGroup check&gt;
      &lt;Label check&gt;
        &lt;Input type="radio" name="isIBAN" innerRef={register} value={false} /&gt; BIC/SWIFT
      &lt;/Label&gt;
    &lt;/FormGroup&gt;             
  &lt;/FormGroup&gt;
  </code></pre>
  
  <p>I dont know if you can do it from the default values:</p>
  
  <pre><code>const { register, handleSubmit, errors, setValue, getValues  } = useForm(
    {
      defaultValues:{
        accountNr: "XXXXKB20201555555555",
        bic:"XXXDKKK",
        isIBAN:true
      }
    }
  );
  </code></pre>
  
  <p>How is the correct way to default the first radio button to checked? I could make another hook but there must be some built in in react hooks forms?</p>