meta fails because to generates a tuple.

example.kt

    
fun provideServer() : RoutingHttpHandler {

    fun ping(): HttpHandler = {
        Response(OK).with(
                Body.string(TEXT_PLAIN).toLens() of "pong"
        )
    }

    val filter: Filter = ResponseFilters.ReportRouteLatency(Clock.systemUTC(), { name: String, latency: Duration ->
        println(name + " took " + latency)
    })

    val security = ApiKey(Query.int().required("apiKey"), {
        println("foo" + (it == 42))
        it == 42
    })

    val contract = contract(OpenApi(ApiInfo("the greatest api", "v1.0"), Jackson), "/docs/swagger.json", security,
            ("/ping")
                bindContract  GET
                to ::ping
                meta RouteMeta("ping", "Are we still there?").returning("Pong" to OK)
    )
  
  ....