@Override
    public Object clone() {
		return super.clone();
    }
Returns a shallow copy of this <tt>GapList</tt> instance
(The elements themselves are not copied).
The capacity of the list will be set to the number of elements,
so after calling clone(), size and capacity are equal.

@return a copy of this <tt>GapList</tt> instance
jphp-runtime/src/php/runtime/memory/support/GapList.java