/api/store/type-aliases/store/value/"><code>Value</code></a> (by providing a <code>null</code> wildcard).</p><p>Use the optional mutator parameter to indicate that there is code in the listener that will mutate <a href="/api/the-essentials/creating-stores/store/"><code>Store</code></a> data. If set to <code>false</code> (or omitted), such mutations will be silently ignored. All relevant mutator listeners (with this flag set to <code>true</code>) are called <em>before</em> any non-mutator listeners (since th