;=&nbsp;<span class="string">"%int64_to_nativeint"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;of_string&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int64&nbsp;=&nbsp;<span class="string">"caml_int64_of_string"</span><br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;of_string_opt&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int64&nbsp;option<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;to_string&nbsp;:&nbsp;int64&nbsp;<span c