odule</span> <span class="keyword">type</span> <a href="module-type-S/index.html">S</a></span><span> = <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div><div class="spec-doc"><p>A functional map interface where only the <code>N</code> most recently-accessed elements are guaranteed to be persisted, similarly to an LRU cache. The map stores at most <code>2*N</code> elements.</p></div></div><div class="odoc-spec"><div class="spec module anchored" id="module-Make"><a href=