code: @SuppressWarnings("unchecked")
    public void clear() {
      this.capacity = this.initialCapacity;
      this.hash_mask = capacity - 1;
  
      this.expandThreshold = (int) (capacity * maxLoadFactor);
      this.shrinkThreshold = (int) (capacity * minLoadFactor);
  
      entries = new LinkedElement[capacity];
      size = 0;
      modification++;
    }
docs: Clear the set. Resize it to the original capacity.