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(<my-custom-element innerText="foo" />, container);
      const customElement = container.querySelector('my-custom-element');
      expect(customElement.getAttribute('innerText')).toBe(null);
      expect(customElement.hasChildNodes()).toBe(false);
      
      
      ReactDOM.render(<my-custom-element innerText="bar" />, container);
      expect(customElement.getAttribute('innerText')).toBe(null);
      expect(customElement.hasChildNodes()).toBe(false);
    });
    
    it('textContent should not work on custom elements', () => {
      const container = document.createElement('div');
      ReactDOM.render(<my-custom-element textContent="foo" />, container);
      const customElement = container.querySelector('my-custom-element');
      expect(customElement.getAttribute('textContent')).toBe(null);
      expect(customElement.hasChildNodes()).toBe(false);
      
      
      ReactDOM.render(<my-custom-element textContent="bar" />, container);
      expect(customElement.getAttribute('textContent')).toBe(null);
      expect(customElement.hasChildNodes()).toBe(false);
    });
    
    it('values should not be converted to booleans when assigning into custom elements', () => {
      const container = document.createElement('div');
      document.body.appendChild(container);
      ReactDOM.render(<my-custom-element />, container);
      const customElement = container.querySelector('my-custom-element');