InternalKtorSubclassing

@RequiresOptIn(level = RequiresOptIn.Level.ERROR, message = "This type is not intended to be subclassed outside Ktor and its plugins.")
@Target(allowedTargets = [AnnotationTarget.CLASS])
annotation class InternalKtorSubclassing(source)

Marks open types that are not intended to be subclassed outside Ktor and its plugins.

Subclassing requires explicit opt-in via OptIn.

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