.NET API Catalog

IReadOnlySet<T>
- Contains(T)
- IsProperSubsetOf(IEnumerable<T>)
- IsProperSupersetOf(IEnumerable<T>)
- IsSubsetOf(IEnumerable<T>)
- IsSupersetOf(IEnumerable<T>)
- Overlaps(IEnumerable<T>)
- SetEquals(IEnumerable<T>)

net6.0-windows
    namespace System.Collections.Generic
{
    public interface IReadOnlySet<T> : IReadOnlyCollection<T>, IEnumerable, IEnumerable<T>
    {
        bool IsSubsetOf(IEnumerable<T>! other);
    }
}

Information specific to `net6.0`
nuget.org	0.0 % Reference this API
.NET	5.06.07.08.09.0
Assembly	System.Runtime , Version=6.0.0.0, PublicKeyToken=b03f5f7f11d50a3a
Referencing	Your project needs a package reference to `System.Runtime.Experimental`.
Package	System.Runtime.Experimental (6.0.2) net6.0
Platform Restrictions	This API is supported on all platforms.

Built-in API
Package-provided API