al</span> compare : <span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span> <span>&#45;&gt;</span> int)</span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> <a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> int</code></dt><dd><p>If the list have the same length this a lexicographic compare. If one list is shorter, then the missing value 