Stone.js API
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    validationBlueprint: ValidationBlueprint = ...

    Opt-in blueprint: import and register it to enable validation.

    It contributes the validation service provider and the route middleware that validates what a route declared under validation. Both stone.providers and stone.router.middleware are arrays, so this merges with the rest of the app rather than replacing anything.

    The route middleware is a no-op on routes that declare nothing, so enabling validation costs an application that does not use it one function call per request.