err = en.Append(0x8b, 0xa3, 0x69, 0x66, 0x73)
	if err != nil {
		return
	}
	err = en.WriteUint64(z.InitFreeSpace)
	if err != nil {
		err = msgp.WrapError(err, "InitFreeSpace")
		return
	}
	// write "ic"
	err = en.Append(0xa2, 0x69, 0x63)
	if err != nil {
		return
	}
	err = en.WriteUint64(z.InitCapacity)
	if err != nil {
		err = msgp.WrapError(err, "InitCapacity")
		return
	}