@Contract(pure = true)
  public static @NotNull <T> Set<@NotNull T> createConcurrentIdentitySet(int initialCapacity) {
    return Collections.newSetFromMap(createConcurrentMap(initialCapacity, 0.75f, 16, HashingStrategy.identity()));
  }
@Contract(pure = true)
  public static @NotNull <T> Set<@NotNull T> createConcurrentIdentitySet(int initialCapacity)