ion</h6><div class="odoc-spec"><div class="spec type anchored" id="type-graph"><a href="#type-graph" class="anchor"></a><code><span><span class="keyword">type</span> graph</span></code></div></div><h6 id="core-functions"><a href="#core-functions" class="anchor"></a>Core functions</h6><div class="odoc-spec"><div class="spec value anchored" id="val-shape_or_value"><a href="#val-shape_or_value" class="anchor"></a><code><span><span class="keyword">val</span> shape_or_value : <span><a href="Optimiser/Operator/Sy