Function getPrototypeOf

tests/unit/utils/isX.test.js:122–128

()

    let proxy;
    proxy = new Proxy({}, {
      getPrototypeOf() {
        calls += 1;
        if (calls > 5) {
          throw new Error('cycled');
        }
        return proxy;
      }
    });

    expect(utils.hasOwnInPrototypeChain(proxy, 'missing')).toEqual(false);