Stashbox by Peter Csajtai

<PackageReference Include="Stashbox" Version="5.17.0" />

.NET API 234,496 bytes

ImmutableRefTree<TValue>

sealed class ImmutableRefTree<TValue>

public static readonly ImmutableRefTree<TValue> Empty

public readonly bool IsEmpty

public ImmutableRefTree<TValue> AddOrSkip(TValue value)

public ImmutableRefTree<TValue> Remove(TValue value)

public IEnumerable<TValue> Walk()