<PackageReference Include="Microsoft.Packaging.Tools" Version="1.0.0-preview1-25301-01" />

System.Collections.Immutable.IImmutableDictionary<TKey, TValue>

public interface IImmutableDictionary<TKey, TValue> : IReadOnlyDictionary<TKey, TValue>, IReadOnlyCollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, IEnumerable
IImmutableDictionary<TKey, TValue> Add(TKey key, TValue value)

IImmutableDictionary<TKey, TValue> AddRange(IEnumerable<KeyValuePair<TKey, TValue>> pairs)

IImmutableDictionary<TKey, TValue> Clear()

bool Contains(KeyValuePair<TKey, TValue> pair)

IImmutableDictionary<TKey, TValue> Remove(TKey key)

IImmutableDictionary<TKey, TValue> RemoveRange(IEnumerable<TKey> keys)

IImmutableDictionary<TKey, TValue> SetItem(TKey key, TValue value)

IImmutableDictionary<TKey, TValue> SetItems(IEnumerable<KeyValuePair<TKey, TValue>> items)

bool TryGetKey(TKey equalKey, out TKey actualKey)