vely.</p>

<p>The <code class="code">0u</code> prefix reads the input as an unsigned integer in the range
   <code class="code">[0,&nbsp;2*Int32.max_int+1]</code>.  If the input exceeds <a href="Int32.html#VALmax_int"><code class="code">Int32.max_int</code></a>
   it is converted to the signed integer
   <code class="code">Int32.min_int&nbsp;+&nbsp;input&nbsp;-&nbsp;Int32.max_int&nbsp;-&nbsp;1</code>.</p>

<p>The <code class="code">_</code> (underscore) character can appear anywhere in the string
   and is 