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?
const container = document.createElement('div');
      ReactDOM.render(<some-custom-element foo={true} />, container);
      const node = container.firstChild;
      expect(node.getAttribute('foo')).toBe('true');
      ReactDOM.render(<some-custom-element foo={false} />, container);
      expect(node.getAttribute('foo')).toBe('false');
      ReactDOM.render(<some-custom-element />, container);
      expect(node.hasAttribute('foo')).toBe(false);
      ReactDOM.render(<some-custom-element foo={true} />, container);
      expect(node.hasAttribute('foo')).toBe(true);
    });
    it('does not strip the on* attributes', () => {
      const container = document.createElement('div');
      ReactDOM.render(<some-custom-element onx="bar" />, container);
      const node = container.firstChild;
      expect(node.getAttribute('onx')).toBe('bar');
      ReactDOM.render(<some-custom-element onx="buzz" />, container);
      expect(node.getAttribute('onx')).toBe('buzz');
      ReactDOM.render(<some-custom-element />, container);
      expect(node.hasAttribute('onx')).toBe(false);
      ReactDOM.render(<some-custom-element onx="bar" />, container);
      expect(node.getAttribute('onx')).toBe('bar');
    });
  });
  it('receives events in specific order', () => {
    const eventOrder = [];
    const track = tag => () => eventOrder.push(tag);
    const outerRef = React.createRef();
    const innerRef = React.createRef();
    function OuterReactApp() {