_ = zb0001Mask
	if z.Prefix == "" {
		zb0001Len--
		zb0001Mask |= 0x2
	}
	// variable map header, size zb0001Len
	o = append(o, 0x80|uint8(zb0001Len))

	// skip if no fields are to be emitted
	if zb0001Len != 0 {
		// string "bk"
		o = append(o, 0xa2, 0x62, 0x6b)
		o = msgp.AppendString(o, z.Bucket)
		if (zb0001Mask & 0x2) == 0 { // if not omitted
			// string "pr"
			o = append(o, 0xa2, 0x70, 0x72)