o = msgp.AppendString(o, z.TransitionTier)
	o = msgp.AppendString(o, z.TransitionVersionID)
	o = msgp.AppendBool(o, z.ExpireRestored)
	o = msgp.AppendString(o, z.DataDir)
	o = msgp.AppendBool(o, z.XLV1)
	o = msgp.AppendTime(o, z.ModTime)
	o = msgp.AppendInt64(o, z.Size)
	o = msgp.AppendUint32(o, z.Mode)
	o = msgp.AppendUint64(o, z.WrittenByVersion)
	o = msgp.AppendMapHeader(o, uint32(len(z.Metadata)))

// generate the correct format.
//
// For parsing this time format, see [ParseTime].
const TimeFormat = "Mon, 02 Jan 2006 15:04:05 GMT"

// appendTime is a non-allocating version of []byte(t.UTC().Format(TimeFormat))
func appendTime(b []byte, t time.Time) []byte {
	const days = "SunMonTueWedThuFriSat"
	const months = "JanFebMarAprMayJunJulAugSepOctNovDec"

	t = t.UTC()
	yy, mm, dd := t.Date()