">type</span><span class="special">;</span>

        <span class="keyword">static</span> <span class="identifier">type</span> <span class="identifier">call</span><span class="special">()</span>
        <span class="special">{</span>
            <span class="keyword">return</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">deep_copy</span><span class="special">(</span>
                <span class="char">'{'</span> <span class="special">&lt;&lt;</span> <span c