val encodings = ConcurrentHashMap<Class<*>, EncodingDetails>()

    /**
     * Returns the proper encoding provider for the given type, or null, if not covered by Java Object serialization.
     */
    fun encodingFor(type: Class<*>): Encoding? {
        return encodings.computeIfAbsent(type) { t -> calculateEncoding(t) }.encoding
    }

    private
    fun calculateEncoding(type: Class<*>): EncodingDetails {

    override fun encodingForType(type: Class<*>): Encoding? =
        type.takeIf { Serializable::class.java.isAssignableFrom(it) }?.let { serializableType ->
            lookup.encodingFor(serializableType)
        }

    override suspend fun ReadContext.decode(): Any =
        decodePreservingIdentity { id ->
            when (readEnum<Format>()) {
                Format.WriteObject -> {