**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/)

var link = new ReactLink('yolo', jest.fn());
    ReactTestUtils.renderIntoDocument(<input type="text" valueLink={link} />);
    expect(console.error.calls.count()).toBe(1);
    expect(console.error.calls.argsFor(0)[0]).toContain(
      '`valueLink` prop on `input` is deprecated; set `value` and `onChange` instead.'
    );
    ReactTestUtils.renderIntoDocument(
      <input type="text" value="zoink" onChange={jest.fn()} />
    );
    expect(console.error.calls.count()).toBe(1);
    ReactTestUtils.renderIntoDocument(<input type="text" value="zoink" />);
    expect(console.error.calls.count()).toBe(2);
  });
  it('should warn with value and no onChange handler and readOnly specified', function() {
    ReactTestUtils.renderIntoDocument(
      <input type="text" value="zoink" readOnly={true} />
    );
    expect(console.error.calls.count()).toBe(0);
    ReactTestUtils.renderIntoDocument(
      <input type="text" value="zoink" readOnly={false} />
    );
    expect(console.error.calls.count()).toBe(1);
  });
  it('should have a this value of undefined if bind is not used', function() {
    var unboundInputOnChange = function() {
      expect(this).toBe(undefined);
    };
    var instance = <input type="text" onChange={unboundInputOnChange} />;
    instance = ReactTestUtils.renderIntoDocument(instance);
    ReactTestUtils.Simulate.change(instance);