public static T Instance <T>(this VowelContext _, T instance) => instance;
public static Extents.Instance <T> Activation <T>(this VowelContext _) => Extents.Instance <T> .Implementation;
public static T Instance <T>(this VowelContext _) => Extents.Instance <T> .Implementation.Activate();
public static Extents.Extent <T> Extent <T>(this VowelContext _) => Extents.Extent <T> .Default;