Stashbox by Peter Csajtai

<PackageReference Include="Stashbox" Version="3.2.1-preview-569" />

.NET API 153,600 bytes

ExpandableArray<TKey, TItem>

class ExpandableArray<TKey, TItem> : ExpandableArray<KeyValue<TKey, TItem>>

public ExpandableArray()

public void AddOrKeep(TKey item, TItem value)

public bool ContainsReference(TKey key)

public TItem GetOrDefault(TKey key, bool byRef)

public int IndexAndValueOf(TKey key, out TItem value)