docs: protected void beforeInsertDummies(int index, int length) {
  	if (index > size || index < 0) 
  		throw new IndexOutOfBoundsException("Index: "+index+", Size: "+size);
  	if (length > 0) {
  		ensureCapacity(size + length);
  		setSizeRaw(size + length);
  		replaceFromToWithFrom(index+length,size-1,this,index);
  	}
  }