/p>
<ul>
<li>Primary constructors</li>
<li>Collection expressions</li>
<li>Inline arrays</li>
<li>Optional parameters in lambda expressions</li>
<li>ref readonly parameters</li>
<li>Alias any type</li>
<li>Experimental attribute</li>
</ul>
<h2 id="section-16">13.0</h2>
<p><em>Released November 2024</em></p>
<ul>
<li>Params collections</li>
<li>New lock type</li>
<li>New escape sequence - \e</li>
<li>Implicit indexer access in object initializers</li>
<li>ref locals and unsafe contexts in iterators and async