Hwo to update/delete ref value in VueJS 3 composition api

Im using a ref value to be able to only execute a click event if the ref value is changing

for example if I want to update/del the array inside let myRef = ref([]);
do i just drill inside the proxy and do the operations
like

 selectedElements.value.push(3);

which returns
Proxy {0: 3}

or what is the correct way to update/del the ref.value ?

export default {  
  setup() {
    let myRef   = ref([]);
  
    return {
     myRef
    };
  },
};
</script>