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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)

state = {
          value: 2,
        };
        onChange = event => {
          this.setState({value: event.target.value});
        };
        render() {
          const {value} = this.state;
          return <input type="text" value={value} onChange={this.onChange} />;
        }
      }
      const stub = ReactDOM.render(<Stub />, container);
      const node = ReactDOM.findDOMNode(stub);
      setUntrackedValue.call(node, '2.0');
      dispatchEventOnNode(node, 'input');
      expect(node.getAttribute('value')).toBe('2.0');
      expect(node.value).toBe('2.0');
    });
  });
  it('does change the string ".98" to "0.98" with no change handler', () => {
    class Stub extends React.Component {