❔ Are there read only collections that don't box enumerators?

ReadOnlyCollection<T>

ReadOnlyCollection<T>

boxes struct enumerators since it stores

IList<T>

IList<T>

internally.

ImmutableList<T>

ImmutableList<T>

does not box enumerator, but I actually want to publically expose a List as read only and privately be able to modify it.

❔ Are there read only collections that don't box enumerators? - C#