Overriding session middleware fails

[andreespirela]

Overriding session middleware fails.

Minimal reproduction:

import { MandarineCore, Mandarine, Override, MandarineSecurity, Controller, GET } from "https://deno.land/x/mandarinets@v2.1.1/mod.ts";
import { MandarineSessionContainer } from "https://deno.land/x/mandarinets@v2.1.1/main-core/mandarine-native/sessions/mandarineSessionContainer.ts";

@Override()
class WebMvcConfigurer extends Mandarine.Native.WebMvcConfigurer {
  getSessionContainer(): MandarineSessionContainer {
    return new MandarineSessionContainer();
  }
}

@Controller()
class Test {
  @GET("/hello")
  hello() {
    return "Hello, world!";
  }
}

new MandarineCore().MVC().run();

Stacktrace:

TypeError: Cannot use 'in' operator to search for '0' in undefined
    at new KeyStack (keyStack.ts:33:12)
    at Function.getCookieForSession (sessions.util.ts:35:31)
    at SessionMiddleware.createSessionCookie (sessionMiddleware.ts:83:78)
    at MandarineMvcFrameworkStarter.preRequestInternalMiddlewares (mandarineMvcFrameworkStarter.ts:80:44)
    at responseHandler (mandarineMvcFrameworkStarter.ts:156:18)
    at dispatch (middleware.ts:41:13)
    at router.ts:866:20
    at dispatch (middleware.ts:41:13)
    at composedMiddleware (middleware.ts:44:12)
    at dispatch (router.ts:872:28)

[andreespirela]

The reason why this is happening is because changeSessionContainer called in the proxy is not setting the keys property. It is set when Mandarine is initialized but after that it is ignored.