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(nodeValueSetter).toHaveBeenCalledTimes(2);
    });
    it('should not incur unnecessary DOM mutations for boolean properties', () => {
      const container = document.createElement('div');
      ReactDOM.render(<div checked={true} />, container);
      const node = container.firstChild;
      let nodeValue = true;
      const nodeValueSetter = jest.fn();
      Object.defineProperty(node, 'checked', {
        get: function() {
          return nodeValue;
        },
        set: nodeValueSetter.mockImplementation(function(newValue) {
          nodeValue = newValue;
        }),
      });
      ReactDOM.render(<div checked={true} />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(0);
      ReactDOM.render(<div />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(1);
      ReactDOM.render(<div checked={false} />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(2);
      ReactDOM.render(<div checked={true} />, container);
      expect(nodeValueSetter).toHaveBeenCalledTimes(3);
    });
    it('should ignore attribute list for elements with the "is" attribute', () => {
      const container = document.createElement('div');
      ReactDOM.render(<button is="test" cowabunga="chevynova" />, container);
      expect(container.firstChild.hasAttribute('cowabunga')).toBe(true);