[BUG] child node shouldn't update with the number of children changed

```jsx
import { createElement, useState } from 'rax';

function Child() {
console.log('Child render');
return

;
}

function Parent() {
const [arr, setArr] = useState([1]);

return (<>

{arr.map(item => )}
);
}
```

Start by running the JSX reproduction in the issue and observe the Child render logs before and after clicking the div. Trace the rendering path for the keyed children; done means adding a child does not rerender the existing Child component.

Written by the indexing model from the issue text.