When setting boolean attributes on Web Components
`<x-search somebool name={this.props.name} />`
they get rendered as attribute/value pairs instead
`<x-search somebool="true" name={this.props.name}>`

This causes problems with some AMP components, for eg. `<amp-iframe />` which has a `resizable` attribute that gets rendered as `resizable="true"`. This results in non valid AMP content and developers crying with blood tears on their keyboards :)
> The attribute 'resizable' in tag 'amp-iframe' is set to the invalid value 'true'. (see https://www.ampproject.org/docs/reference/components/amp-iframe)

Is there any reason for the current behaviour? Will changing this break something else?
ReactDOM.render(<div />, container);
      expect(node.setAttribute).toHaveBeenCalledTimes(1);
      expect(node.removeAttribute).toHaveBeenCalledTimes(1);
      ReactDOM.render(<div id="" />, container);
      expect(node.setAttribute).toHaveBeenCalledTimes(2);
      expect(node.removeAttribute).toHaveBeenCalledTimes(1);
      ReactDOM.render(<div />, container);
      expect(node.setAttribute).toHaveBeenCalledTimes(2);
      expect(node.removeAttribute).toHaveBeenCalledTimes(2);
    });
    it('should not incur unnecessary DOM mutations for string properties', () => {
      const container = document.createElement('div');
      ReactDOM.render(<div value="" />, container);
      const node = container.firstChild;
      const nodeValueSetter = jest.fn();
      const oldSetAttribute = node.setAttribute.bind(node);
      node.setAttribute = function(key, value) {
        oldSetAttribute(key, value);
        nodeValueSetter(key, value);
      };
      ReactDOM.render(<div value="foo" />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(1);
      ReactDOM.render(<div value="foo" />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(1);
      ReactDOM.render(<div />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(1);
      ReactDOM.render(<div value={null} />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(1);
      ReactDOM.render(<div value="" />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(2);