class="anchor"></a><code>isAdded: bool,</code></td></tr></table><code>}</code>;</dt></dl><dl><dt class="spec value" id="val-make"><a href="#val-make" class="anchor"></a><code><span class="keyword">let</span> make: type_:MusicTheory.Model.ExtensionType.t <span>=&gt;</span> ?&#8288;accidental:MusicTheory.Model.Accidental.t <span>=&gt;</span> unit <span>=&gt;</span> <a href="#type-t">t</a>;</code></dt><dt class="spec value" id="val-makeWithInterval"><a href="#val-makeWithInterval" class="anchor"></a><code><spa