@Contract(pure = true)
  public static @Unmodifiable @NotNull <T> List<T> filterIsInstance(@NotNull Collection<?> collection, @NotNull Class<? extends T> aClass) {
    //noinspection unchecked
    return filter((Collection<T>)collection, Conditions.instanceOf(aClass));
  }
@Contract(pure = true)
  public static @Unmodifiable @NotNull <T> List<T> filterIsInstance(@NotNull Collection<?> collection, @NotNull Class<? extends T> aClass)