Stashbox by Peter Csajtai

<PackageReference Include="Stashbox" Version="3.1.1-preview-551" />

 Pair<T1, T2>

class Pair<T1, T2>
namespace Stashbox.Utils { internal class Pair<T1, T2> { public T1 I1 { get; set; } public T2 I2 { get; set; } public Pair(T1 item1, T2 item2) { I1 = item1; I2 = item2; } } }