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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)

}),
    });
    ReactDOM.render(<input value="a" onChange={() => {}} />, container);
    expect(nodeValueSetter).toHaveBeenCalledTimes(0);
    ReactDOM.render(<input value="b" onChange={() => {}} />, container);
    expect(nodeValueSetter).toHaveBeenCalledTimes(1);
  });
  it('should not incur unnecessary DOM mutations for numeric type conversion', () => {
    ReactDOM.render(<input value="0" onChange={() => {}} />, container);
    const node = container.firstChild;
    let nodeValue = '0';
    const nodeValueSetter = jest.fn();
    Object.defineProperty(node, 'value', {
      get: function() {
        return nodeValue;
      },
      set: nodeValueSetter.mockImplementation(function(newValue) {
        nodeValue = newValue;
      }),
    });
    ReactDOM.render(<input value={0} onChange={() => {}} />, container);
    expect(nodeValueSetter).toHaveBeenCalledTimes(0);
  });
  it('should not incur unnecessary DOM mutations for the boolean type conversion', () => {
    ReactDOM.render(<input value="true" onChange={() => {}} />, container);
    const node = container.firstChild;
    let nodeValue = 'true';
    const nodeValueSetter = jest.fn();
    Object.defineProperty(node, 'value', {
      get: function() {