<PackageReference Include="NUnit" Version="4.5.1" />

System.Runtime.CompilerServices.OverloadResolutionPriorityAttribute

Specifies the priority of a member in overload resolution. When unspecified, the default priority is 0.
namespace System.Runtime.CompilerServices { internal sealed class OverloadResolutionPriorityAttribute : Attribute { public int Priority { get; } public OverloadResolutionPriorityAttribute(int priority); } }