encoder.writeSmallInt(properties.size());
        for (Map.Entry<String, ValueSnapshot> entry : properties.entrySet()) {
            encoder.writeString(entry.getKey());
            writeValueSnapshot(encoder, entry.getValue());
        }
    }

    private ImmutableSortedMap<String, FileCollectionFingerprint> readFingerprints(Decoder decoder) throws Exception {
        int count = decoder.readSmallInt();