expectedBucketNumber: Int,
    maxNumberInBucket: Int,
    noElementSplitFunction: (Int) -> List<R> = { throw IllegalArgumentException("More buckets than things to split") },
    canRunTogether: (T, T) -> Boolean = { _, _ -> true }
): List<R> {
    if (list.isEmpty()) {
        return noElementSplitFunction(expectedBucketNumber)
    }
    if (expectedBucketNumber == 1) {