code: public CacheKeyBuilder appendCacheablesIgnoringOrder(Collection<? extends Cacheable> input)
    {
      appendItem(CACHEABLE_LIST_KEY, cacheableCollectionToByteArray(input, false));
      return this;
    }
docs: Add a collection of Cacheables to the cache key.
  Cacheables in the collection are sorted by their byte representation and
  concatenated without any separator.
  
  @param input a collection of Cacheables to be included in the cache key
  @return this instance