docs: public boolean decreasePriority(E key, double priority) {
      Entry<E> entry = getEntry(key);
      if (entry == null) {
        entry = makeEntry(key);
      }
      if (compare(priority, entry.priority) >= 0) {
        return false;
      }
      entry.priority = priority;
      heapifyDown(entry);
      return true;
    }