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This value controls the GC messages on standard error output.
       It is a sum of some of the following flags, to print messages
       on the corresponding events:<ul>
<li><code class="code">0x001</code> Start of major GC cycle.</li>
<li><code class="code">0x002</code> Minor collection and major GC slice.</li>
<li><code class="code">0x004</code> Growing and shrinking of the heap.</li>
<li><code class="code">0x008</code> Resizing o