kd">open</span> <span class="kd">class</span> <span class="kt">CollectionViewDiffableDataSource</span><span class="o">&lt;</span><span class="kt">SectionIdentifierType</span><span class="p">,</span> <span class="kt">ItemIdentifierType</span><span class="o">&gt;</span> <span class="p">:</span> <span class="kt">NSObject</span><span class="p">,</span> <span class="kt">UICollectionViewDataSource</span> <span class="k">where</span> <span class="kt">SectionIdentifierType</span> <span class="p">:</span> <span clas