* @param smallElementAggregateFunction the function used to aggregate tiny elements into a large bucket
 * @param expectedBucketNumber the return value's size should be expectedBucketNumber
 */
fun <T, R> splitIntoBuckets(
    list: LinkedList<T>,
    toIntFunction: (T) -> Int,
    largeElementSplitFunction: (T, Int) -> List<R>,
    smallElementAggregateFunction: (List<T>) -> R,
    expectedBucketNumber: Int,