sclass PtBuffer > RandomAccessAbstractList<Pt> {
  LongBuffer buf = new LongBuffer;
  
  *() {}
  *(int size) { buf.allocate(size); }
  
  *(Iterable<Pt> l) {
    if (l != null) for (Pt p : l) add(p);
  }
  
  public int size() { ret buf.size(); }
  
  public Pt get(int i) {
    ret longToPt(buf.get(i));
  }
  
  public long getLong(int i) {
    ret buf.get(i);
  }
  
  public Pt set(int i, Pt val) {
    Pt old = get(i);
    buf.set(i, ptToLong(val));
    ret old;
  }
  
  public bool add(Pt p) {
    buf.add(ptToLong(p));
    true;
  }
  
  public void add(int x, int y) {
    buf.add(ptToLong(x, y));
  }
  
  public Pt remove(int i) {
    Pt p = get(i);
    buf.remove(i);
    ret p;
  }
  
  public void clear { buf.clear(); }
}

Began life as a copy of #1033710