_float&nbsp;:&nbsp;int64&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;float&nbsp;=&nbsp;<span class="string">"caml_int64_to_float"</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="string">"caml_int64_to_float_unboxed"</span>&nbsp;[@@unboxed]&nbsp;[@@noalloc]<br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;of_int32&nbsp;:&nbsp;int32&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int64&nbsp;=&nbsp;<span class="string">"%int64_of_int32"</span><br>
&nbsp;&nbsp;<span class="keyword">external</spa