void setValueForTesting(InternalEntry<K, V, ?> entry, V value) {
      this.map.entryHelper.setValue(self(), castForTesting(entry), value);
    }

    /** Unsafely returns a fresh entry. */
    E newEntryForTesting(K key, int hash, @Nullable InternalEntry<K, V, ?> next) {
      return this.map.entryHelper.newEntry(self(), key, hash, castForTesting(next));
    }