Stashbox by Peter Csajtai

<PackageReference Include="Stashbox" Version="5.7.1" />

.NET API 210,944 bytes

ImmutebleTreeDebugView<TValue>

class ImmutebleTreeDebugView<TValue>

public ReadOnlyKeyValue<int, TValue>[] Items { get; }

public ImmutebleTreeDebugView(ImmutableTree<TValue> tree)