if err != nil {
		return
	}
	err = en.WriteInt64(z.ReplicatedSize)
	if err != nil {
		err = msgp.WrapError(err, "ReplicatedSize")
		return
	}
	// write "FailedSize"
	err = en.Append(0xaa, 0x46, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x53, 0x69, 0x7a, 0x65)
	if err != nil {
		return
	}
	err = en.WriteInt64(z.FailedSize)
	if err != nil {
		err = msgp.WrapError(err, "FailedSize")

		if err != nil {
			return
		}
		err = en.WriteInt64(z.Size)
		if err != nil {
			err = msgp.WrapError(err, "Size")
			return
		}
		// write "MTime"
		err = en.Append(0xa5, 0x4d, 0x54, 0x69, 0x6d, 0x65)
		if err != nil {
			return
		}
		err = en.WriteInt64(z.ModTime)
		if err != nil {
			err = msgp.WrapError(err, "ModTime")
			return
		}

	if err != nil {
		return
	}
	err = en.WriteInt64(z.ReplicatedSize)
	if err != nil {
		err = msgp.WrapError(err, "ReplicatedSize")
		return
	}
	// write "ReplicaSize"
	err = en.Append(0xab, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x53, 0x69, 0x7a, 0x65)
	if err != nil {
		return
	}
	err = en.WriteInt64(z.ReplicaSize)
	if err != nil {
		err = msgp.WrapError(err, "ReplicaSize")

		err = en.Append(0xa2, 0x6e, 0x76)
		if err != nil {
			return
		}
		err = en.WriteInt(za0002.NumVersions)
		if err != nil {
			err = msgp.WrapError(err, "Tiers", za0001, "NumVersions")
			return
		}
		// write "no"
		err = en.Append(0xa2, 0x6e, 0x6f)
		if err != nil {
			return
		}
		err = en.WriteInt(za0002.NumObjects)
		if err != nil {
			err = msgp.WrapError(err, "Tiers", za0001, "NumObjects")

    }

    @Override
    protected ConcurrentMap<K, V> delegate() {
      return delegate;
    }

    void writeMapTo(ObjectOutputStream out) throws IOException {
      out.writeInt(delegate.size());
      for (Entry<K, V> entry : delegate.entrySet()) {
        out.writeObject(entry.getKey());
        out.writeObject(entry.getValue());
      }
      out.writeObject(null); // terminate entries