super(fromMap, transformer);
    }

    @Override
    @CheckForNull
    public Entry<K, V2> ceilingEntry(@ParametricNullness K key) {
      return transformEntry(fromMap().ceilingEntry(key));
    }

    @Override
    @CheckForNull
    public K ceilingKey(@ParametricNullness K key) {
      return fromMap().ceilingKey(key);
    }