if z.ObjectV1 == nil {
		zb0001Len--
		zb0001Mask |= 0x2
	}
	if z.ObjectV2 == nil {
		zb0001Len--
		zb0001Mask |= 0x4
	}
	if z.DeleteMarker == nil {
		zb0001Len--
		zb0001Mask |= 0x8
	}
	// variable map header, size zb0001Len
	err = en.Append(0x80 | uint8(zb0001Len))
	if err != nil {
		return
	}

	// skip if no fields are to be emitted
	if zb0001Len != 0 {