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    </li><li name="react.core.ReactiveLibrary.SignalTrait#observeLaterWithOldValue" visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
      <a id="observeLaterWithOldValue(f:(A,A)=&gt;Unit):react.core.ReactiveLibrary.Cancelable"></a>
      <a id="observeLaterWithOldValue((A,A)⇒Unit):Cancelable"></a>
      <h4 class="signature">
      <span class="modifier_kind">
        <span class="modifier"></span>
        <span class="kind">def</span>
      </span>
      <span class="symbol">
  