deep watcher not fired if watching an array of refs

[jacekkarczmarczyk]

1.1.1 (working)

https://codepen.io/jkarczm/pen/dyRYOZo?editors=1010

vue 3 (working)

https://sfc.vuejs.org/#eyJBcHAudnVlIjoiPHRlbXBsYXRlPnt7IGFyciB9fTxidXR0b24gQGNsaWNrPVwiY2xpY2tcIj51cGRhdGUgYXJyYXk8L2J1dHRvbj48L3RlbXBsYXRlPlxuPHNjcmlwdD5cbmltcG9ydCB7IHJlZiwgd2F0Y2ggfSBmcm9tICd2dWUnO1xuICBcbmV4cG9ydCBkZWZhdWx0IHtcbiAgc2V0dXAgKCkge1xuICAgIGNvbnN0IGFyciA9IHJlZihbMSwgMiwgM10pO1xuICAgIFxuICAgIHdhdGNoIChbYXJyXSwgKCkgPT4gYWxlcnQoJ2FycmF5IHVwZGF0ZWQnKSwgeyBkZWVwOiB0cnVlIH0pO1xuICAgIFxuICAgIHJldHVybiB7IGFyciwgY2xpY2s6ICgpID0+IGFyci52YWx1ZS5wdXNoKDUpIH07XG4gIH1cbn07XG48L3NjcmlwdD4ifQ==

1.1.2 (not working), same in 1.1.3

https://codepen.io/jkarczm/pen/rNwOWqb?editors=0010

  setup () {
    const arr = ref([1, 2, 3]);
    
    watch ([arr], () => alert('array updated'), { deep: true });
    
    return { arr, click: () => arr.value.push(5) };
  }

Seems to be broken by #790 / #791

[jacekkarczmarczyk]

Hmmm i think it's a dupe of #805