func mergeSortedSlice(left, right, serverOrder []interface{}, mergeKey string, kind reflect.Kind) []interface{} {
	// Returns if l is less than r, and if both have been found.
	// If l and r both present and l is in front of r, l is less than r.
	less := func(l, r interface{}) (bool, bool) {
		li := index(serverOrder, l, mergeKey, kind)
		ri := index(serverOrder, r, mergeKey, kind)
		if li >= 0 && ri >= 0 {