As described on http://facebook.github.io/react/docs/forms.html, the onChange handler of an input should fire when the checked state changes.  However, it actually fires when the radio button is clicked,

In other words, it fails to fire when a checked radio button is unchecked (by checking a different radio button), and it fires even without a state change when a checked radio button is clicked.

In short, it's missing checked transtions true->false, and it's reporting spurious transitions true->true.

}
ReactDOMComponent.displayName = 'ReactDOMComponent';
ReactDOMComponent.Mixin = {
  /**
   * Generates root tag markup then recurses. This method has side effects and
   * is not idempotent.
   *
   * @internal
   * @param {ReactReconcileTransaction|ReactServerRenderingTransaction} transaction
   * @param {?ReactDOMComponent} the containing DOM component instance
   * @param {?object} info about the native container
   * @param {object} context
   * @return {string} The computed markup.
   */
  mountComponent: function(
    transaction,
    nativeParent,
    nativeContainerInfo,
    context
  ) {
    this._rootNodeID = globalIdCounter++;
    this._domID = nativeContainerInfo._idCounter++;
    this._nativeParent = nativeParent;
    this._nativeContainerInfo = nativeContainerInfo;
    var props = this._currentElement.props;
    switch (this._tag) {
      case 'iframe':
      case 'object':
      case 'img':
      case 'form':