 GC smoothing system. The unit is one millionth of a full GC.
    Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if <code class="code">n</code> is negative, return 0 if n is larger
    than the smoothing window.<br>
<b>Since</b> 4.03.0<br>
</div>

<pre><span id="VALget_credit"><span class="keyword">val</span> get_credit</span> : <code class="type">unit -&gt; int</code></pre><div class="info ">
<code class="code">get_credit&nbsp;()</code> returns the current size of the "wo