code: void _resizeImpl(int pointCount) {
  		if (pointCount < 0)
  			throw new IllegalArgumentException();
  
  		if (pointCount == m_pointCount)
  			return;
  
  		m_pointCount = pointCount;
  		notifyModified(DirtyFlags.DirtyAllInternal);
  	}
docs: Checked vs. Jan 11, 2011