private void debugDump() {
		debugLog("values: size= " +values.length + ", data= "+ debugPrint(values));
		debugLog("size=" + size + ", start=" + start + ", end=" + end +
				", gapStart=" + gapStart + ", gapSize=" + gapSize + ", gapIndex=" + gapIndex);
		debugLog(toString());
	}
Private method to dump fields of GapList.
It is only called if the code is run in development mode.
jphp-runtime/src/php/runtime/memory/support/GapList.java