Method constructor

web/main.js:1124–1126

(isShallow2 = false)

}
class MutableReactiveHandler extends BaseReactiveHandler {
  constructor(isShallow2 = false) {
    super(false, isShallow2);
  }
  set(target, key, value, receiver) {
    let oldValue = target[key];
    const isArrayWithIntegerKey = isArray(target) && isIntegerKey(key);