@Contract(value = " -> new", pure = true)
  @Deprecated
  public static @NotNull <K,V> Map<@NotNull K,V> createWeakMap() {
    return new WeakHashMap<>();
  }
@Contract(value = " -> new", pure = true)
  @Deprecated
  public static @NotNull <K,V> Map<@NotNull K,V> createWeakMap()