**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 stub = <input type="text" value={0} onChange={handler} />;
    var container = document.createElement('div');
    var node = ReactDOM.render(stub, container);
    setUntrackedValue(node, 'giraffe');
    var fakeNativeEvent = new function() {};
    fakeNativeEvent.target = node;
    fakeNativeEvent.path = [node, container];
    ReactTestUtils.simulateNativeEventOnNode(
      EventConstants.topLevelTypes.topInput,
      node,
      fakeNativeEvent
    );
    expect(handled).toBe(true);
  });
  it('should not set a value for submit buttons unnecessarily', function() {
    var stub = <input type="submit" />;
    stub = ReactTestUtils.renderIntoDocument(stub);
    var node = ReactDOM.findDOMNode(stub);
    
    
    
    
    expect(
      !node.hasAttribute('value') || node.getAttribute('value').length > 0
    ).toBe(true);
  });
  it('should control radio buttons', function() {
    var RadioGroup = React.createClass({
      render: function() {
        return (