}
        ImmutableMultimap<String, HashCode> rootHashes = readRootHashes(decoder);
        HashCode strategyConfigurationHash = hashCodeSerializer.read(decoder);
        return new SerializableFileCollectionFingerprint(fingerprints, rootHashes, strategyConfigurationHash);
    }

    private ImmutableMultimap<String, HashCode> readRootHashes(Decoder decoder) throws IOException {
        int numberOfRoots = decoder.readSmallInt();