dExtensionType.t</code><code> = </code><code>{</code><table class="record"><tr id="type-t.type_" class="anchored"><td class="def field"><a href="#type-t.type_" class="anchor"></a><code>type_: MusicTheory.Model.ExtensionType.t,</code></td></tr><tr id="type-t.accidental" class="anchored"><td class="def field"><a href="#type-t.accidental" class="anchor"></a><code>accidental: MusicTheory.Model.Accidental.t,</code></td></tr><tr id="type-t.isAdded" class="anchored"><td class="def field"><a href="#type-t.isAdded" 