* Objects.equals(o, element)} would return {@code true}. Otherwise returns {@code false}, even in
   * cases where {@link Collection#contains} might throw {@link NullPointerException} or {@link
   * ClassCastException}.
   */
  public static boolean contains(Iterable<?> iterable, @Nullable Object element) {
    if (iterable instanceof Collection) {

  // Natural order

  /**
   * Returns a serializable ordering that uses the natural order of the values. The ordering throws
   * a {@link NullPointerException} when passed a null parameter.
   *
   * <p>The type specification is {@code <C extends Comparable>}, instead of the technically correct

  public void testEncloseAll_nullValue() {
    List<@Nullable Integer> nullFirst = Lists.newArrayList(null, 0);
    assertThrows(NullPointerException.class, () -> Range.encloseAll((List<Integer>) nullFirst));
    List<@Nullable Integer> nullNotFirst = Lists.newArrayList(0, null);
    assertThrows(NullPointerException.class, () -> Range.encloseAll((List<Integer>) nullNotFirst));
  }

  public void testEquivalentFactories() {

    testComparator(comparator, Integer.MIN_VALUE, -1, 0, 1, Integer.MAX_VALUE);
    assertThrows(NullPointerException.class, () -> comparator.compare(1, null));
    assertThrows(NullPointerException.class, () -> comparator.compare(null, 2));
    assertThrows(NullPointerException.class, () -> comparator.compare(null, null));
    assertSame(comparator, reserialize(comparator));

    testComparator(comparator, Integer.MIN_VALUE, -1, 0, 1, Integer.MAX_VALUE);
    assertThrows(NullPointerException.class, () -> comparator.compare(1, null));
    assertThrows(NullPointerException.class, () -> comparator.compare(null, 2));
    assertThrows(NullPointerException.class, () -> comparator.compare(null, null));
    assertSame(comparator, reserialize(comparator));

   * Delegates to {@link Map#get}. Returns {@code null} on {@code ClassCastException} and {@code
   * NullPointerException}.
   */
  static <V extends @Nullable Object> @Nullable V safeGet(Map<?, V> map, @Nullable Object key) {
    checkNotNull(map);
    try {
      return map.get(key);
    } catch (ClassCastException | NullPointerException e) {
      return null;
    }
  }

  /**

   * Delegates to {@link Map#get}. Returns {@code null} on {@code ClassCastException} and {@code
   * NullPointerException}.
   */
  static <V extends @Nullable Object> @Nullable V safeGet(Map<?, V> map, @Nullable Object key) {
    checkNotNull(map);
    try {
      return map.get(key);
    } catch (ClassCastException | NullPointerException e) {
      return null;
    }
  }

  /**

   *
   * @param collection a collection of {@code Number} instances
   * @return an array containing the same values as {@code collection}, in the same order, converted
   *     to primitives
   * @throws NullPointerException if {@code collection} or any of its elements is null
   * @since 1.0 (parameter was {@code Collection<Float>} before 12.0)
   */
  public static float[] toArray(Collection<? extends Number> collection) {

    List<Object> list = new ArrayList<>(equalityGroup.length);
    for (int i = 0; i < equalityGroup.length; i++) {
      Object element = equalityGroup[i];
      if (element == null) {
        throw new NullPointerException("at index " + i);
      }
      list.add(element);
    }
    equalityGroups.add(list);
    return this;
  }

  /** Run tests on equals method, throwing a failure on an invalid test */

     * @return A function that applies each function in the collection in order until a non-null result is found.
     *         If all functions return null, the composite function returns null.
     *
     * @throws NullPointerException if the input collection is null or contains null elements.
     */
    static UnaryOperator<String> chain(Collection<? extends UnaryOperator<String>> functions) {
        return s -> {