**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/)

postMountWrapper: function(inst) {
    var props = inst._currentElement.props;
    
    
    var node = ReactDOMComponentTree.getNodeFromInstance(inst);
    
    
    
    
    
    if (props.type !== 'submit' && props.type !== 'reset') {
      node.value = node.value;
    }
    
    
    
    
    
    var name = node.name;
    if (name !== '') {
      node.name = '';
    }
    node.defaultChecked = !node.defaultChecked;
    node.defaultChecked = !node.defaultChecked;
    if (name !== '') {
      node.name = name;
    }
  },
};
function _handleChange(event) {