olved">Ppx_deriving_runtime</span>.string</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-get_diff"><a href="#val-get_diff" class="anchor"></a><code><span><span class="keyword">val</span> get_diff : <span><span><a href="#type-item">item</a> array</span> <span class="arrow">&#45;&gt;</span></span> <span><span><a href="#type-item">item</a> array</span> <span class="arrow">&#45;&gt;</span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Return