code: function isCheckable(elem) {
    var type = elem.type;
    var nodeName = elem.nodeName;
    return nodeName && nodeName.toLowerCase() === 'input' && (type === 'checkbox' || type === 'radio');
  }
docs: Copyright (c) 2013-present, Facebook, Inc.
  
  This source code is licensed under the MIT license found in the
  LICENSE file in the root directory of this source tree.
  
  @providesModule inputValueTracking