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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 = {type: 'number', value: 1000};
      render() {
        const {value, type} = this.state;
        return <input onChange={() => {}} type={type} value={value} />;
      }
    }
    const input = ReactDOM.render(<Input />, container);
    const node = ReactDOM.findDOMNode(input);
    
    
    input.setState({type: 'text', value: 'Test'});
    expect(node.value).toEqual('Test');
  });
  it('resets value of date/time input to fix bugs in iOS Safari', () => {
    function strify(x) {
      return JSON.stringify(x, null, 2);
    }
    const log = [];
    const originalCreateElement = document.createElement;
    spyOnDevAndProd(document, 'createElement').and.callFake(function(type) {
      const el = originalCreateElement.apply(this, arguments);
      let value = '';
      if (type === 'input') {
        Object.defineProperty(el, 'value', {
          get: function() {
            return value;