in tools/rhythm-ui/src/LazyElement.ts [9:19]
function _updateLitElement(element: LazyElement, klass: ILitElementConstructor) {
//Object.setPrototypeOf(element, klass.prototype);
//new klass();
Object.setPrototypeOf(element, klass.prototype);
//debugger;
//LazyElement._upgradingElement = undefined;
element.requestUpdate();
if (element.isConnected) {
element.connectedCallback();
}
}