public void ensureCapacity(int minCapacity) {
		doModify();
		doEnsureCapacity(minCapacity);
    }
Increases the capacity of this <tt>GapList</tt> instance, if
necessary, to ensure that it can hold at least the number of elements
specified by the minimum capacity argument.

@param   minCapacity   the desired minimum capacity
jphp-runtime/src/php/runtime/memory/support/IList.java