code: public static <E> ImmutableMultiset<E> copyOf(E[] elements) {
      return copyOf(Arrays.asList(elements));
    }
docs: Returns an immutable multiset containing the given elements.
  
  <p>The multiset is ordered by the first occurrence of each element. For
  example, {@code ImmutableMultiset.copyOf([2, 3, 1, 3])} yields a multiset
  with elements in the order {@code 2, 3, 3, 1}.
  
  @throws NullPointerException if any of {@code elements} is null
  @since 6.0