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