an style="white-space:nowrap">nbytes:<a class="type" title="The standard Int type." href="../../Int.html">Int</a></span>):<a class="type" title="The standard Void type." href="../../Void.html">Void</a></code></h3><div class="doc"><p>Inform that we are about to write at least <code>nbytes</code> bytes.</p>
<p>The underlying implementation can allocate proper working space depending
on this information, or simply ignore it. This is not a mandatory call
but a tip and is only used in some specific cases.</p></d