*/
fun <T : WriteContext, U> T.runWriteOperation(writeOperation: suspend T.() -> U): U =
    runToCompletion {
        writeOperation()
    }


/**
 * [Starts][startCoroutine] the suspending [block], asserts it runs
 * to completion and returns its result.
 */
private
fun <R> runToCompletion(block: suspend () -> R): R {
    var completion: Result<R>? = null
    block.startCoroutine(

    val classLoader: ClassLoader

    fun beanStateReaderFor(beanType: Class<*>): BeanStateReader

    /**
     * When in immediate mode, [read] calls are NOT suspending.
     * Useful for bridging with non-suspending serialization protocols such as [java.io.Serializable].
     */
    var immediateMode: Boolean // TODO:configuration-cache prevent StackOverflowErrors when crossing protocols