err = en.Append(0xa2, 0x73, 0x7a)
	if err != nil {
		return
	}
	err = en.WriteInt64(z.Size)
	if err != nil {
		err = msgp.WrapError(err, "Size")
		return
	}
	// write "os"
	err = en.Append(0xa2, 0x6f, 0x73)
	if err != nil {
		return
	}
	err = en.WriteUint64(z.Objects)
	if err != nil {
		err = msgp.WrapError(err, "Objects")
		return
	}
	// write "vs"