public static bool Is1 <T1, T2, T3, T4, T5, T6, T7, T8>(this IOrType <T1, T2, T3, T4, T5, T6, T7, T8> self, out T1 t1)
{
if (self.Possibly1() is IIsDefinately <T1> definate)
{
t1 = definate.Value;
return(true);
}
t1 = default;
return(false);
}
