@Override
  public boolean containsValue(@Nullable Object value) {
    return seekByValue(value, smearedHash(value)) != null;
  }

  @Override
  public @Nullable V get(@Nullable Object key) {
    return valueOrNull(seekByKey(key, smearedHash(key)));
  }

  @CanIgnoreReturnValue
  @Override
  public @Nullable V put(@ParametricNullness K key, @ParametricNullness V value) {
    return put(key, value, false);
  }

            return null;
          } else if (cut.equals(restriction.lowerBound)) {
            // it might be present, truncated on the left
            Range<C> candidate = Maps.valueOrNull(rangesByLowerBound.floorEntry(cut));
            if (candidate != null && candidate.upperBound.compareTo(restriction.lowerBound) > 0) {
              return candidate.intersection(restriction);
            }

  }

  static <K extends @Nullable Object> @Nullable K keyOrNull(@Nullable Entry<K, ?> entry) {
    return (entry == null) ? null : entry.getKey();
  }

  static <V extends @Nullable Object> @Nullable V valueOrNull(@Nullable Entry<?, V> entry) {
    return (entry == null) ? null : entry.getValue();
  }

  static class SortedKeySet<K extends @Nullable Object, V extends @Nullable Object>

  }

  static <K extends @Nullable Object> @Nullable K keyOrNull(@Nullable Entry<K, ?> entry) {
    return (entry == null) ? null : entry.getKey();
  }

  static <V extends @Nullable Object> @Nullable V valueOrNull(@Nullable Entry<?, V> entry) {
    return (entry == null) ? null : entry.getValue();
  }

  static class SortedKeySet<K extends @Nullable Object, V extends @Nullable Object>