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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)

<input type="radio" value="value" onChange={() => null} />,
      container,
    );
    ReactDOM.render(<input type="radio" />, container);
  });
  it('should not warn if radio value changes but never becomes uncontrolled', () => {
    ReactDOM.render(
      <input type="radio" checked={false} onChange={() => null} />,
      container,
    );
    ReactDOM.render(
      <input
        type="radio"
        value="value"
        defaultChecked={true}
        checked={false}
        onChange={() => null}
      />,
      container,
    );
  });
  it('should warn if radio checked false changes to become uncontrolled', () => {
    ReactDOM.render(
      <input
        type="radio"
        value="value"
        checked={false}
        onChange={() => null}
      />,
      container,