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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)

const node = ((element: any): InputWithWrapperState);
  if (__DEV__) {
    const controlled = isControlled(props);
    if (
      !node._wrapperState.controlled &&
      controlled &&
      !didWarnUncontrolledToControlled
    ) {
      warning(
        false,
        'A component is changing an uncontrolled input of type %s 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',
        props.type,
      );
      didWarnUncontrolledToControlled = true;
    }
    if (
      node._wrapperState.controlled &&
      !controlled &&
      !didWarnControlledToUncontrolled
    ) {
      warning(
        false,
        'A component is changing a controlled input of type %s to be uncontrolled. ' +
          'Input elements should not switch from controlled to uncontrolled (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',
        props.type,