ss="keywordsign">'</span>b&nbsp;=&nbsp;<span class="string">"%identity"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;is_block&nbsp;:&nbsp;<span class="constructor">Obj</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool&nbsp;=&nbsp;<span class="string">"caml_obj_is_block"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;is_int&nbsp;:&nbsp;<span class="constructor">Obj</span>.t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool&nbsp;=&nbsp;<span class="stri