遅すぎわろた

public struct TupleWrapper<T> {
public TupleWrapper(object tuple) { tupleOrValue = tuple; }
public T Value => (T) tupleOrValue;
public int Length => CountItemField() < 8 ? CountItemField() : 7 + GetRest().Length;
public TupleWrapper<T> this[int index] => GetItem(index + 1);
private TupleWrapper<T> GetItem(int i) => i < 8 ? new TupleWrapper<T>(GetItemField(i).GetValue(Tuple)) : GetRest().GetItem(i - 7);
private FieldInfo GetItemField(int i) => Tuple.GetType().GetField($"Item{i}");
private TupleWrapper<T> GetRest() => new TupleWrapper<T>(GetRestField().GetValue(Tuple));
private FieldInfo GetRestField() => Tuple.GetType().GetField("Rest");
private int CountItemField() => Tuple.GetType().GetGenericArguments().Length;
private object Tuple => tupleOrValue;
private readonly object tupleOrValue;
}

var t = (
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20),
(11, 22, 33, 44)
);
var w = new TupleWrapper<int>(t);

for (int i = 0; i < w.Length; ++i) {
for (int j = 0; j < w[i].Length; ++j) {
Console.Write($"{ w[i][j].Value } ");
}

Console.WriteLine();
}