private void normalize() {
		if (start == 0 && end == 0 && gapSize == 0 && gapStart == 0 && gapIndex == 0) {
			return;
		}
		init(toArray(), size());
	}
Normalize data of GapList so the elements are found
from values[0] to values[size-1].
This method can help to speed up operations like sort or
binarySearch.
jphp-runtime/src/php/runtime/memory/support/GapList.java