"#C2_L7" id=C2_L7></a><a href="#C2_L8" id=C2_L8></a></span></code></pre>
<p>This synchronous behavior can also lead to observers being fired multiple
times when observing multiple properties:</p>
<pre class="language-javascript line-numbers"><code class="javascript language-javascript">Person<span class="token punctuation">.</span><span class="token function">reopen</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token literal-property property">partOfNa