comes very useful when you register wildcard listeners. These listen to changes at a particular part of the <a href="/api/the-essentials/creating-stores/store/"><code>Store</code></a> hierarchy but not necessarily to a specific object.</p><p>So for example, you can listen to changes to any <a href="/api/store/type-aliases/store/row/"><code>Row</code></a> in a given <a href="/api/store/type-aliases/store/table/"><code>Table</code></a>. To wildcard what you want to listen to, simply use <code>null</code> in p