Each child in a list should have a unique "key" prop.

```
Each child in a list should have a unique "key" prop.

Check the render method of `Er`. See https://react.dev/link/warning-keys for more information.
<$r>		
```

i have this warning on first render even for most simplest case when expand root node
```
<ObjectView
                    valueGetter={() => ({ "a": 1 })}
                    name="test"
                />
```
