ywordsign">-&gt;</span>&nbsp;int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Obj</span>.t&nbsp;=&nbsp;<span class="string">"caml_obj_block"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;dup&nbsp;:&nbsp;<span class="constructor">Obj</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Obj</span>.t&nbsp;=&nbsp;<span class="string">"caml_obj_dup"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;truncate&nbsp;:&nb