**Do you want to request a _feature_ or report a _bug_?**
Bug
**What is the current behavior?**
React at the beginning rounds `input[type=range]` value to 0 or 1, and then looks at step parameter which is 0.1 for example. The result is incorrect value of input after component mounts. When I put `value` attribute after `step` attributes, it works fine.
**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: https://jsfiddle.net/reactjs/69z2wepo/).**
Demo: https://jsfiddle.net/2Lm4gy5k/ Comment or uncomment line 13 and 14 to see the difference.

**What is the expected behavior?**
To always look at step parameter and then round the value (if required).
**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
v15.1.0 (Opera, Chrome, Firefox). 

Yes, works in v.0.14.0 (https://jsfiddle.net/wrcnLugd/)

expect(console.error.calls.count()).toBe(1);
  });
  it('should throw if both checked and checkedLink are provided', function() {
    var node = document.createElement('div');
    var link = new ReactLink(true, jest.fn());
    var instance = <input type="checkbox" checkedLink={link} />;
    expect(() => ReactDOM.render(instance, node)).not.toThrow();
    instance =
      <input
        type="checkbox"
        checkedLink={link}
        checked="false"
        onChange={emptyFunction}
      />;
    expect(() => ReactDOM.render(instance, node)).toThrow();
    instance =
      <input type="checkbox" checkedLink={link} onChange={emptyFunction} />;
    expect(() => ReactDOM.render(instance, node)).toThrow();
  });
  it('should update defaultValue to empty string', function() {
    var container = document.createElement('div');
    ReactDOM.render(<input type="text" defaultValue={'foo'} />, container);
    ReactDOM.render(<input type="text" defaultValue={''} />, container);
    expect(container.firstChild.defaultValue).toBe('');
  });
  it('should throw if both checkedLink and valueLink are provided', function() {
    var node = document.createElement('div');
    var link = new ReactLink(true, jest.fn());
    var instance = <input type="checkbox" checkedLink={link} />;
    expect(() => ReactDOM.render(instance, node)).not.toThrow();