case 1:
        // requireNonNull is safe because the first `size` elements have been filled in.
        Entry<K, V> onlyEntry = requireNonNull(entryArray[0]);
        return of(comparator, onlyEntry.getKey(), onlyEntry.getValue());
      default:
        Object[] keys = new Object[size];
        Object[] values = new Object[size];
        if (sameComparator) {
          // Need to check for nulls, but don't need to sort or validate.

      case 1:
        // requireNonNull is safe because the first `size` elements have been filled in.
        Entry<K, V> onlyEntry = requireNonNull(entryArray[0]);
        return of(comparator, onlyEntry.getKey(), onlyEntry.getValue());
      default:
        Object[] keys = new Object[size];
        Object[] values = new Object[size];
        if (sameComparator) {
          // Need to check for nulls, but don't need to sort or validate.

  }

  private static <K, V> void putEntryWithChecks(
      SortedMap<K, V> map, Entry<? extends K, ? extends V> entry) {
    K key = checkNotNull(entry.getKey());
    V value = checkNotNull(entry.getValue());
    if (map.containsKey(key)) {
      // When a collision happens, the colliding entry is the first entry
      // of the tail map.
      Entry<K, V> previousEntry = map.tailMap(key).entrySet().iterator().next();