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<code class="code"><span class="keyword">sig</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;length&nbsp;:&nbsp;bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;=&nbsp;<span class="string">"%bytes_length"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;get&nbsp;:&nbsp;bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;char&nbsp;=&nbsp