n">-&gt;</span>&nbsp;unit)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;map&nbsp;:&nbsp;f:(char&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;char)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bytes<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;mapi&nbsp;:&nbsp;f:(int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;char&n