validates method
Validates every request with request before the handler runs (after
the route middleware), like a type-hinted FormRequest in Laravel:
authorize() false answers 403, invalid input 422. The handler reads
the result with request.validated(). The rules also document the
route (dartisan openapi:generate, generated clients).
Implementation
RouteEntry validates(FormRequest request) {
_formRequest = request;
return this;
}