s="r-in"><span><span class="va">str_vlen</span><span class="op">$</span><span class="fu">is_vlen</span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] TRUE</span>
<span class="r-in"><span><span class="va">str_vlen</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Class: H5T_STRING</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Datatype: H5T_STRING {</span>
<span class="r-out co"><span class="