Unsafe typecast long to int:

private static final class RefSortingSink<T> extends Sink.ChainedReference<T, T> {
    public void begin(long size) {
        list = (size >= 0) ? new ArrayList<T>((int) size) : new ArrayList<T>();
    }
    ...........
private static final class IntSortingSink extends Sink.ChainedInt<Integer> {
    public void begin(long size) {
        b = (size > 0) ? new SpinedBuffer.OfInt((int) size) : new SpinedBuffer.OfInt();
    }
    ...........
private static final class LongSortingSink extends Sink.ChainedLong<Long> {
    public void begin(long size) {
        b = (size > 0) ? new SpinedBuffer.OfLong((int) size) : new SpinedBuffer.OfLong();
    }
    ...........
private static final class DoubleSortingSink extends Sink.ChainedDouble<Double> {
    public void begin(long size) {
        b = (size > 0) ? new SpinedBuffer.OfDouble((int) size) : new SpinedBuffer.OfDouble();
    }