System.Collections.Immutable.ImmutableSortedSet<T>
public sealed class ImmutableSortedSet<T> : IImmutableSet<T>, IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable, ISortKeyCollection<T>, IReadOnlyList<T>, IList<T>, ICollection<T>, ISet<T>, IList, ICollection, IStrongEnumerable<T, Enumerator<T>>
public sealed class Builder<T> : ISortKeyCollection<T>, IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable, ISet<T>, ICollection<T>, ICollection
public struct Enumerator<T> : IEnumerator<T>, IEnumerator, IDisposable, ISecurePooledObjectUser, IStrongEnumerator<T>