title: What's the default `Router.navigate()` behavior about query params?
body: <p>The <code>navigate()</code> method from <code>Router</code> takes a <code>queryParamsHandling</code> option that, if set, can either be <code>merge</code> or <code>preserve</code>.</p>
  <p>What's the default behavior of the <code>Router</code> when it comes to query params?</p>