@Contract(value = " -> new", pure = true)
  public static @NotNull <K, V> ConcurrentMap<@NotNull K, @NotNull V> createConcurrentWeakKeyWeakValueIdentityMap() {
    return new ConcurrentWeakKeyWeakValueHashMap<>(100, 0.75f, Runtime.getRuntime().availableProcessors(), HashingStrategy.identity());
  }
@Contract(value = " -> new", pure = true)
  public static @NotNull <K, V> ConcurrentMap<@NotNull K, @NotNull V> createConcurrentWeakKeyWeakValueIdentityMap()