n cases for defining the behaviour when mapping over multiple elements in a stencil
</br></div>
  <h3>Union Cases</h3>
  <table class="table table-bordered member-list">
    <thead>
      <tr><td>Union Case</td><td>Description</td></tr>
    </thead>
    <tbody>
      <tr>
        <td class="member-name">

          <code onmouseout="hideTip(event, '26', 26)" onmouseover="showTip(event, '26', 26)">
            Preserve
          </code>
          <div class="tip" id="26">
            <strong>Signature:</stro