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**Do you want to request a *feature* or report a *bug*?**

Bug.

**What is the current behavior?**

Creating an `<input type='submit'` with `value={undefined}` results in a button with no text. https://codesandbox.io/s/nn7p94y3rl

The same behaviour can be seen with `type='reset'`

I have a PR open with a proposed fix. https://github.com/facebook/react/pull/12780

**What is the expected behavior?**

The input should use the browser's default value for the input (Submit for en, etc.).

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

React 16.3.2. Chrome 66.0.3359.139. macOS 10.13.4. Works in React 15 (unsure of earlier versions)

/**
 * 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.
 *
 * @flow
 */
import {getCurrentFiberOwnerNameInDevOrNull} from 'react-reconciler/src/ReactCurrentFiber';
import invariant from 'shared/invariant';
import warning from 'shared/warning';
import * as DOMPropertyOperations from './DOMPropertyOperations';
import {getFiberCurrentPropsFromNode} from './ReactDOMComponentTree';
import {getToStringValue, toString} from './ToStringValue';
import ReactControlledValuePropTypes from '../shared/ReactControlledValuePropTypes';
import * as inputValueTracking from './inputValueTracking';
import type {ToStringValue} from './ToStringValue';
type InputWithWrapperState = HTMLInputElement & {
  _wrapperState: {
    initialValue: ToStringValue,
    initialChecked: ?boolean,
    controlled?: boolean,
  },
};
let didWarnValueDefaultValue = false;
let didWarnCheckedDefaultChecked = false;
let didWarnControlledToUncontrolled = false;
let didWarnUncontrolledToControlled = false;
function isControlled(props) {