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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 instance = ReactDOM.render(<ControlledInputs />, container);
    setUntrackedValue.call(instance.a, 'giraffe');
    
    
    dispatchEventOnNode(instance.a, 'input');
    expect(instance.a.value).toBe('lion');
    expect(instance.b.checked).toBe(true);
  });
  describe('switching text inputs between numeric and string numbers', () => {
    it('does change the number 2 to "2.0" with no change handler', () => {
      const stub = <input type="text" value={2} onChange={jest.fn()} />;
      const node = ReactDOM.render(stub, container);
      setUntrackedValue.call(node, '2.0');
      dispatchEventOnNode(node, 'input');
      expect(node.getAttribute('value')).toBe('2');
      expect(node.value).toBe('2');
    });
    it('does change the string "2" to "2.0" with no change handler', () => {
      const stub = <input type="text" value={'2'} onChange={jest.fn()} />;
      const node = ReactDOM.render(stub, container);
      setUntrackedValue.call(node, '2.0');
      dispatchEventOnNode(node, 'input');
      expect(node.getAttribute('value')).toBe('2');
      expect(node.value).toBe('2');
    });
    it('changes the number 2 to "2.0" using a change handler', () => {
      class Stub extends React.Component {