I don't know if this is an issue with React or IE11 but when an the input initially contains an EN-dash (8211) it fires the change event. 
JSFiddle http://jsfiddle.net/uH539/10/

it('should display "foobar" for `defaultValue` of `objToString`', function() {
    var objToString = {
      toString: function() {
        return 'foobar';
      },
    };
    var stub = <input type="text" defaultValue={objToString} />;
    stub = ReactTestUtils.renderIntoDocument(stub);
    var node = ReactDOM.findDOMNode(stub);
    expect(node.value).toBe('foobar');
  });
  it('should display `value` of number 0', function() {
    var stub = <input type="text" value={0} />;
    stub = ReactTestUtils.renderIntoDocument(stub);
    var node = ReactDOM.findDOMNode(stub);
    expect(node.value).toBe('0');
  });
  it('should allow setting `value` to `true`', function() {
    var container = document.createElement('div');
    var stub = <input type="text" value="yolo" onChange={emptyFunction} />;
    stub = ReactDOM.render(stub, container);
    var node = ReactDOM.findDOMNode(stub);
    expect(node.value).toBe('yolo');
    stub = ReactDOM.render(
      <input type="text" value={true} onChange={emptyFunction} />,
      container
    );
    expect(node.value).toEqual('true');
  });
  it('should allow setting `value` to `false`', function() {