called with the <code>changes</code> parameter, it will be used to make an incremental change to the <a href="/api/the-essentials/creating-stores/store/"><code>Store</code></a>. If not, but the <code>content</code> parameter is available, that will be used to make a wholesale change to the <a href="/api/the-essentials/creating-stores/store/"><code>Store</code></a>. If neither are present, the content will be loaded using the <a href="/api/the-essentials/persisting-stores/persister/"><code>Persister</code></