*feature*

>Warning: A component is `contentEditable` and contains `children` managed by React. It is now your responsibility to guarantee that none of those nodes are unexpectedly modified or duplicated. This is probably not intentional.

It would help heaps if I would know _which_ component is causing this.
ReactDOM.render(<div dangerouslySetInnerHTML={{__html: 0}} />, container);
      expect(container.textContent).toEqual('0');
      ReactDOM.render(
        <div dangerouslySetInnerHTML={{__html: false}} />,
        container,
      );
      expect(container.textContent).toEqual('false');
      ReactDOM.render(
        <div dangerouslySetInnerHTML={{__html: ''}} />,
        container,
      );
      expect(container.textContent).toEqual('');
      ReactDOM.render(
        <div dangerouslySetInnerHTML={{__html: null}} />,
        container,
      );
      expect(container.textContent).toEqual('');
      ReactDOM.render(
        <div dangerouslySetInnerHTML={{__html: undefined}} />,
        container,
      );
      expect(container.textContent).toEqual('');
    });
    it('should remove attributes', () => {
      var container = document.createElement('div');
      ReactDOM.render(<img height="17" />, container);
      expect(container.firstChild.hasAttribute('height')).toBe(true);
      ReactDOM.render(<img />, container);
      expect(container.firstChild.hasAttribute('height')).toBe(false);
    });