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**Do you want to request a *feature* or report a *bug*?**

Bug

**What is the current behavior?**

See fiddle https://jsfiddle.net/j2nzg31L/1/

The warning related to the select fires repeatedly.  @gaearon tells me it should dedupe, and that this is a bug.

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template for React 16: https://jsfiddle.net/Luktwrdm/, template for React 15: https://jsfiddle.net/hmbg7e9w/).**

See above

**What is the expected behavior?**

See above

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

16.2
A gorilla!
        </option>
      </select>,
      container,
    );
    expect(node.options[0].selected).toBe(false); 
    expect(node.options[1].selected).toBe(false); 
    ReactDOM.render(
      <select multiple={true} defaultValue={['giraffe']}>
        <option key="monkey" value="monkey">
          A monkey!
        </option>
        <option key="giraffe" value="giraffe">
          A giraffe!
        </option>
        <option key="gorilla" value="gorilla">
          A gorilla!
        </option>
      </select>,
      container,
    );
    expect(node.options[0].selected).toBe(false); 
    expect(node.options[1].selected).toBe(false); 
    expect(node.options[2].selected).toBe(false); 
  });
  it('should warn if value is null', () => {
    spyOnDev(console, 'error');
    ReactTestUtils.renderIntoDocument(
      <select value={null}>
        <option value="test" />