Method floorEntry

guava/src/com/google/common/collect/Maps.java:4291–4294

(@ParametricNullness K key)

    }

    @Override
    public @Nullable Entry<K, V> floorEntry(@ParametricNullness K key) {
      return forward().ceilingEntry(key);
    }

    @Override
    public @Nullable K floorKey(@ParametricNullness K key) {