Segment(MapMakerInternalMap<K, V, E, S> map, int initialCapacity) {
      this.map = map;
      initTable(newEntryArray(initialCapacity));
    }

    /**
     * Returns {@code this} up-casted to the specific {@link Segment} implementation type {@code S}.
     *
     * <p>This method exists so that the {@link Segment} code can be generic in terms of {@code S},
     * the type of the concrete implementation.