if err != nil {
		return
	}
	err = en.WriteInt64(int64(z.UpperBound))
	if err != nil {
		err = msgp.WrapError(err, "UpperBound")
		return
	}
	// write "LowerBound"
	err = en.Append(0xaa, 0x4c, 0x6f, 0x77, 0x65, 0x72, 0x42, 0x6f, 0x75, 0x6e, 0x64)
	if err != nil {
		return
	}
	err = en.WriteInt64(int64(z.LowerBound))
	if err != nil {
		err = msgp.WrapError(err, "LowerBound")