- Shared informers now correctly propagate whether they are synced or not. Individual informer handlers may now check if they are synced or not (new `HasSynced` method). Library support is added to assist controllers in tracking whether their own work is completed for items in the initial list (`AsyncTracker`). ([#113985](https://github.com/kubernetes/kubernetes/pull/113985), [@lavalamp](https://github.com/lavalamp))

they cannot be used as function values.
</p>


<h3 id="Appending_and_copying_slices">Appending to and copying slices</h3>

<p>
The built-in functions <code>append</code> and <code>copy</code> assist in
common slice operations.
For both functions, the result is independent of whether the memory referenced
by the arguments overlaps.
</p>

<p>