protected override M OnNew(IPentad <string, string, string, string, string> tvp)
 => new M(tvp.V1.Over(at.Int64.Of),
          tvp.V2,
          at.Int32.Of(tvp.V3),
          tvp.V4.Over(at.Int32.Of),
          tvp.V5);
 protected override M OnNew(IPentad <S, S, S, S, S> tvp)
 => new M(tvp.V1, tvp.V2, tvp.V3, tvp.V4, tvp.V5);