I have this code

```
       <input name='test' value={1} type='radio' />
       <input name='test' value={2} type='radio' defaultChecked />
```

https://jsfiddle.net/69z2wepo/42137/

And when I click on radio it gives me warning
Warning: Test is changing a uncontrolled input of type radio to be controlled. Input elements should not switch from uncontrolled to controlled (or vice versa). Decide between using a controlled or uncontrolled input element for the lifetime of the component. More info: https://fb.me/react-controlled-components

So its not clear why or is it a bug ?

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @emails react-core
 */
'use strict';
var emptyFunction = require('emptyFunction');
describe('ReactDOMInput', function() {
  var EventConstants;
  var React;
  var ReactDOM;
  var ReactDOMServer;
  var ReactDOMFeatureFlags;
  var ReactLink;
  var ReactTestUtils;
  var inputValueTracking;
  function setUntrackedValue(elem, value) {
    var tracker = inputValueTracking._getTrackerFromNode(elem);
    var current = tracker.getValue();
    elem.value = value;