@Contract(value = "_, -> new", pure = true)
  public static @NotNull <K, V> ConcurrentMap<@NotNull K, @NotNull V> createConcurrentWeakMap(@NotNull HashingStrategy<? super K> strategy) {
    return new ConcurrentWeakHashMap<>(strategy);
  }
@Contract(value = "_, -> new", pure = true)
  public static @NotNull <K, V> ConcurrentMap<@NotNull K, @NotNull V> createConcurrentWeakMap(@NotNull HashingStrategy<? super K> strategy)