ing isla version (<span class="xref-unresolved" title="unresolved reference to &quot;Server.required_version&quot;"><code>Server</code>.required_version</span>)</p><p>The Epoch also include the digest of the Isla configuration. Any change of configuration will wipe out the cache.</p></dd></dl><div class="spec module" id="module-Epoch"><a href="#module-Epoch" class="anchor"></a><code><span class="keyword">module</span> <a href="Epoch/index.html">Epoch</a> : <span class="keyword">sig</span> ... <span class="k